Corrected entry: When Peter arrives at his aunt's home at the beginning of the movie, it's night. He talks to Harry in the kitchen a few minutes later, and look at the purple balloon by Peter's head, it reflects a window with lots of light coming through it.
Corrected entry: Doc Ock's wearing a hospital gown during the operating room massacre yet once outside he's suddenly bare chested.
Plot hole: Harry tells Doc Ock that in order to find Spider-Man he must find Peter first. Doc Ock finds Peter with Mary Jane in the cafe and throws a car through the window straight at them, then later throws Peter against a brick wall. Any normal person would've been killed instantly (or very badly injured), and Doc Ock doesn't yet know that Peter is Spider-Man. Given that Peter is his only lead on Spider-Man, it makes no sense that Doc Ock would try to kill him.
Suggested correction: Doc Ock is being controlled by the arms. They aren't behaving rationally.
Creating a series of silly explanations for obvious plot holes never resolves them. These arms were not behaving irrationally. In many scenes they were shown to be very intelligent. A good example is the scene where they attack doctors who try to remove them from Doc Ock's body. Saying that they weren't behaving rationally is absurd.
He may not have been trying to kill Peter, he could've been trying to make more of a scene of his entry, so Peter would take him more seriously and tell him where Spider-Man was. He could've been thinking of it as a risk of killing Peter though, but his arms made him go crazy.
This is only a theory. Theories never resolve mistakes.
It's not a theory. When Otto is first giving his demonstration to everybody at his apartment, a woman asks if the advanced AI for the tentacles would make him susceptible to being controlled. Otto says that yes it would so he shows everybody the inhibitor chip that he designed so he would not fall under its control. After the inhibitor chip gets destroyed, it's seen that the tentacles have not only taken control of his mind by forcing him to commit crimes, but have slowly driven him insane.
This scene is much too confusing for many people. This entry is correct. This is a mistake.
If these tentacles wanted him to finish the experiment then they wouldn't make him kill the person who has valuable information for him.
The arms are influencing his thoughts but not controlling every part of him. Doc Ock still seems to have control when defending himself but they seem to work in tandem with Ock. The only time they work on their own is when he under anesthetic. As we don't see him before he throws the car, we can only speculate the arms were trying to hurt Peter by themselves.
It's a cool scene regardless man.
Killing Peter would probably send a message to Spider-Man as well, so Ock probably wasn't concerned about being gentle.
Deliberate mistake: Perhaps to avoid getting an R rating or parental complaints notice how in the operating room massacre none of the doctors appear to bleed nor do Doc Ock's tentacles have blood on them.
Suggested correction: The problem is in both versions of the film, basically all of the deaths either happen off-camera, or are things like people being shocked to death or killed by being tossed around and presumably having their backs/necks broken. Most of the deaths would be bloodless or near-bloodless anyways, and the camera simply doesn't linger on the bodies enough to show any blood. This is also why the tentacles aren't really bloody. Sure, it was probably ratings-related, but it isn't technically a mistake.
Revealing mistake: When Peter returns to his old life and walks on the notes of "Raindrops Keep Fallin' on My Head", at a certain point he stumbles and behind him some people look at the camera.
Suggested correction: They are looking in the direction of the camera. It doesn't necessarily mean they are looking at the camera. They could just as well be looking at Peter since he stumbled and fell, which is a pretty normal thing for people to do when someone falls down.
Actually people behind him keeps watching even when Peter restarts to walk normally. I think if they were really watching just him, they would have looked away immediately as he got to his feet.
Corrected entry: Doc Ock robs a bank to get funds to rebuild his machine. He seems to take only three or four bank bags, which, given the size of the machine, doesn't seem like enough to buy all the parts to rebuild it.
Correction: Let's say it wasn't enough, perhaps because Spider-Man intervening prevented him from taking more. He could have robbed another bank or an armored truck offscreen. Showing that, however, would just drag the movie down. Since he has all the equipment he needs, we have to accept that he acquired enough money to pay for it all.
Correction: Just because it "doesn't seem" like enough doesn't make it a plot hole.
Yeah you don't really know what is inside and what seems to be inside are golden coins which are probably worth quite a lot more than bank notes would. There could even be jewellry inside.
Correction: That's not a window being reflected. It's a light in the room being reflected.