Other mistake: When Dick is up in the tree fort, the aliens are looking at him through their hand binoculars, but the image is taken from the same height as Dick. However, since he is higher than they are, they would be seeing him at an angle. The view as seen would be impossible unless they were at the same height as he was.
Suggested correction: What the camera shows is for the audience. It's not meant to be a POV shot of what the three are seeing.
Dick Puts the Id in Cupid - S5-E11
Other mistake: While talking to his therapist, Dick tells her that one of the mishaps that he caused in his relationship with Mary was showing up to a fundraiser naked. While true, this doesn't happen until Episode 13 (Rutherford Beauty) - two episodes later. This was due to the fact that most of Season 5 was aired out of production order.
Suggested correction: The show was produced in the right order, so this isn't a mistake. Being aired out of order isn't a mistake of the show. It should be noted that for each of the 6 season, episodes were constantly aired out of order.
Continuity mistake: As Harry is leaving the party he is dry despite having just been in the shower fully clothed.
Dick Soup for the Soul - S6-E16
Audio problem: When Tommy is talking about how he recruited Sally to help him get into the fraternity, but has gone mad with power, at one point it switches to a wide shot and you can see his mouth isn't moving. (00:19:28)
Tricky Dick - S3-E3
Audio problem: In the epilogue when Harry is singing for the garage band, before he takes the guitar and smashes it, you can see the guitar player is strumming, but only the bass guitar and drum parts are audible. (00:21:20)
Proud Dick - S2-E13
Other mistake: When Dick and Sally are playing with the cat toy in the kitchen, they make a lot of joyous noise while doing so. When the shot changes, we see Mary coming up the stairs to a completely silent home, and she can't seem to locate anyone until Harry pulls her into the closet. The kitchen is only a few feet away from the stairway, so not only should Dick and Sally's voices have still been very audible, but at the very least, Sally should have been in Mary's direct line of sight. (00:15:53 - 00:16:20)
Proud Dick - S2-E13
Revealing mistake: When Harry lands in the yard, you can tell he lands on a crash mat, as the grass beneath him shuffles. (00:01:15)
Scaredy Dick - S3-E5
Continuity mistake: Before the offscreen trick-or-treater starts throwing eggs into Mary's house, you can see she already has egg stains on her jacket from previous takes. (00:17:40)
Continuity mistake: When Caryn is on the desk, her back is to the class. After the pledge, when Dick says "never mind" and the camera angle changes, she's now facing the class.
Dick Puts the Id in Cupid - S5-E11
Factual error: At the police station, in lock up, there's a paper on the bulletin board with a phone number "1-800-VICTIM" An 800 number should have 7 letters/numbers instead of just 6.
Dick's Big Giant Headache (1) - S4-E23
Continuity mistake: After Harry eats the egg, the lid is still up. When Vicki walks in, the lid is down.
Continuity mistake: When everyone is in the living kitchen, Tommy ends up getting 2 darts stuck into the dartboard. When Harry throws the remote, the 2nd dart is missing. But it's back in the wide shots after Jennifer comes in. Later, when Tommy throws another dart, that 3rd one is seen, but not the 2nd one.
Continuity mistake: In the beginning when Dick is talking to Sally and Harry about Mary, the position of his tie changes after he says "what's the point."
Continuity mistake: When Dick gets out of the chair to talk to Tommy, his newspaper is on the chair cushion. Later, it's on top of the pillow.
Continuity mistake: Mary's glass of wine goes from being almost empty to about half full during her conversation with Charlotte. In the same scene Charlotte goes to put the bottle down but in the next shot she is still holding it.
Continuity mistake: During a conversation between Sally, Mary and Nina about posing for "Playpen" magazine, Mary's glasses are on one second, and then off the next. This mistake repeats twice in thirty seconds. They're nowhere to be seen otherwise. (00:13:30)
Continuity mistake: The devil horns, mustache and goatee that Tommy spray paints on the picture of Harry change appearance between shots. (00:16:40 - 00:17:15)
Episode I: the Baby Menace (3) - S5-E1
Revealing mistake: When Tommy is asking if everyone remembers which baby came from which incubator, you can see the baby he his holding in his left arm is just a doll. (00:09:10)
Dick's Big Giant Headache (2) - S4-E24
Revealing mistake: When Stone is about to drop the bowl of punch on Alissa from behind her, you can see she braces herself for it before he starts pouring it on her (she knows it's about to come when he says "Oops"). (00:13:05)
Revealing mistake: When Harry throws the tent against the ground, his left foot bumps against the large rock on the ground and the rock moves. (00:07:20)