Continuity mistake: Season 2, ep. 3, "Kindred". When Peter gets the box with his belongings back from the Irishmen, as Caitlin says "Well?" Peter's hands are in his lap. The angle changes to Peter, who answers "Well, what?" and he suddenly has both hands on the box, with no time to move them between shots. (00:35:55)
Factual error: In Season 2, Episode 3, Peter and the Irish family rob the bookmakers and the security guards shoot at them. In Ireland, even the police don't carry weapons. Let alone security guards.
Continuity mistake: When Claire and West are talking about their abilities on the beach, the close up shots of Claire show that she is wearing earrings, the camera goes to West but when it focuses on Claire again she is no longer wearing them.
Chosen answer: Because he's an idiot. From the story point of view, they needed the vault to actually be physically open so that the release of the virus would be a credible threat. Unfortunately, this required that Peter conveniently forget that he could simply walk through The Wall and use his telekinesis to tear the door open instead. Peter's increasingly large arsenal of abilities, where he ended up having pretty much any ability required for any situation, led to a situation where it became necessary to either have Peter apparently forget that he had a given power, as with the vault door scene, or become naively trusting, as with his refusal to scan Adam's mind to confirm his good intent. This problem, which simply made Peter look increasingly dumb as the show progressed, may well have been a key factor in the decision to severely reduce his ability during season three.
Tailkinker ★