Corrected entry: Near the end of the movie when Michael kills David you see that David has some facial hair, but when Max takes a look at David he is clean shaven.
Corrected entry: At the end of the movie when the vampires come back to get revenge they never asked for permission to enter the home the way Max did. All vampires must get permission from the head of the house to enter.
Correction: It's not that they can't "get in." It's that once you invite them in it renders you "powerless" (according to Max). Let's not forget that David and his friends were all killed. Max was stronger and probably would have won if Grandpa didn't crash into the house and impale him. Basically they can enter anytime...but being invited in gives them an advantage.
Corrected entry: Max makes a point of being invited in, and at the end mentions that inviting a vampire in makes you powerless to them. But who invited David, Carlo and the others in?
Correction: Inviting them in only makes you powerless to harm them (in this movie's interpretation). David and the others aren't invited, therefore Sam and the Frog Brothers are able to use all the standard anti-vampire tactics against them.
Corrected entry: When Sam is singing in the bath, and he flips the comb and drops it into the water, you can hear him "woo woo"-ing, but his lips don't match his singing.
Correction: There is no audio problem. There are two voices singing in the scene. Sam is singing along with a tape and stops singing as the comb falls into the tub, while the tape keeps playing. Again, you can see the tape player only in the Widescreen format.
Corrected entry: In the beginning Lucy (Sam and Michael's mum) is talking grandpa about why she never divorced the boy's father. Then later on she tells Sam the reason she divorced their father was because he never believed in the closet monster. Are they divorced or not?
Correction: The mom doesn't say she didn't divorce the boys' father; she says that a big legal battle wasn't going to help.
Corrected entry: Sam asks his mom if he can sleep in her bed. He sits down and she says "you smell like garlic." He's wearing whole cloves around his neck which don't smell at all until they are cut, crushed, or minced.
Correction: When there are as many as he had around his neck there is a faint smell of garlic. Put several in a jar or bowl and you'll smell it. True that the characteristic garlic smell is very pungent when you prepare it, but even when whole there is the smell, just not as strong. He was close enough to her that she could smell the garlic, but it wasn't overpowering, which is why she simply remarked about it in passing.
Corrected entry: When Max is revealed as the head vampire, Star makes the realization that "YOU'RE the secret David was protecting" but there is no previous reference anywhere in the movie to a secret that David is protecting.
Correction: Just because we didn't see it, doesn't mean it didn't happen. David could've mentioned something about it off camera, or a long time ago (there's no mention of how long he's known Star for, the mention of a "secret" could've been years ago for all we know). Definitely not a mistake.
Corrected entry: In the scene where Michael drinks David's blood and they are all getting ready to celebrate, David's dialogue is "Give me a ride, Marco" as Marco takes Davis for a spin in the wheelchair. The subtitles say "you're all right Michael."
Corrected entry: In the scene where Michael wakes up in bed after falling from the rail bridge, watch Sam's leg movements and listen to the way he says 'Mike' as he enters the room. The slow-motion effect has been left on for a fraction too long, and it looks a little odd.
Correction: 1) A split second odd movement by a character is not a mistake, unless they completely change positions on-screen. 2) You can't just "leave on" the slow-motion effect during filming like you would a DVD player, it's done during the final editing of the film. As such, you wouldn't have the slo-mo from a previous scene "still left on" for the next scene.
Corrected entry: In the scene right after Michael kills David, he pulls Star to him and says, "Don't let them see me like this." If you look at his lips, he does not say that line. (01:27:06)
Correction: Yes, Michael does say the line. If you look very closely during this his lips are moving as he hides behind Star. The focus was mostly on Star's panicked expression, not Michael's mouth.
Corrected entry: In preparation for the attack, Sam is seen crushing a huge sack of garlic, one bulb at a time. But when he contributes to the garlic-holy water bathtub, most of the garlic is still in bulb form, and the crushed garlic is never seen or mentioned anywhere else. (01:15:40)
Correction: They mixed the crushed garlic with holy water to make their "hand grenades", and other small weapons. The reason it is not crushed in the bathtub is that it would take two days to crush all of the bulbs.
Corrected entry: As Sam dunks himself under the water in his bubble bath we see that the tub is full past the rim with bubbles. Seconds later, when he pops up from under the water after hearing the dog jump on Michael, there are no bubbles in the water at all. (00:39:05)
Correction: There are bubbles in the tub when Sam resurfaces, they are at the ends of the tub; they aren't seen unless you view the movie in Widescreen format.
Corrected entry: In the scene where Michael first enters the cave with the lost boys, Marco brings the lost boys Chinese, David says "Chinese, good choice" but his lips just say "Chinese". (00:26:15)
Correction: David actually says the 'good choice' part, his head is just leaned forward and he says it in a way so his lips arent moving.
Corrected entry: When Sam is in the cave while the Frog brothers kill the first vampire, they are sprayed with his blood. However, when he visits his mom at her work, he is totally clean.
Correction: If you notice, his sweater is stained. The vampire blood has dried and left big stains all over his sweater. He's far from clean.
Corrected entry: When everyone is eating dinner with Max, Sam says "would you like some Parmesan cheese?" Max then puts some on his spaghetti and says "it's not cheese, its garlic." Sam's mom takes the bowl and smells it to check. Considering it's minced garlic, everyone at the table would've smelled it! I realize Max and the boys knew it was garlic but the mother did not know this and wouldn't have had to put it right under her nose to smell it.
Correction: Their mother does acknowledge the smell, but assumes it's the dog's breath.
Corrected entry: During the grand finale when the vampires are in Sam's house, he shoots Dwayne with a bow and arrow and Dwayne falls to the floor pretending to be dead. His left arm is down his side. The shot changes to Sam who is looking at him and then returns to Dwayne whose left arm is now up next to his head so that he can push himself off the floor. (01:22:15)
Correction: Just like you said, he is "pretending" to be dead, hence is alive and able to move. In fact, that is part of his plan to jump up and attack Sam when he comes closer. The shot cuts away long enough for him to have moved his arm.
Correction: The lack of facial hair is symbolic of David's return to innocence now that he's no longer a vampire.