- Continuity: In the first scene featuring nextdoor neighbor Mrs. Bates, she places the telephone on the coffee table twice.
- Continuity: When Jane is shocked by her reflection in the mirror, the expression in her face as well as her posture has changed in the next shot.
- Plot holes: When Edwin calls Jane to arrange an interview, she tells him to come to her house - but never provides an address.
- Continuity: Mrs. Bates pays her first visit to the Hudson home during early morning hours (Jane is fixing breakfast) but when she returns to her own home next door supposedly just minutes later, outdoor shadows indicate that hours have passed and it's now early-mid afternoon.
- Continuity: In the film's final scene, when Baby Jane walks up to the ice cream vendor, her lipstick is much lighter than in the rest of the film. Moments after, her lips are once again covered with darker lipstick. Additionally, during the dancing scene subsequently on the beach, even though it's obviously hot out, the ice cream shows no signs of melting whatsoever.
- Continuity: When Blanche removes the note she has typed to throw to her neighbour from the typewriter, the machine's carriage is at the far right. The next shot is a close up of Blanche adding a handwritten footnote to the letter - the typewriter carriage is now positioned centrally.
- Continuity: In one scene Jane parks the Lincoln convertible in the garage head-in. The next time we see the car, it's been backed into the garage.
- Continuity: After Jane kicks Blanche, Blanche falls and Jane walks around her to kick her again, but when she kicks her again, she is in the same position that she was when she first kicked her, obviously as she kicks her from the right side of the screen (she would be on the left side of the screen if she walked around her).
- Revealing mistakes: Blanche's right leg moves - obviously voluntarily - as she talks to the doctor on the phone, just before Jane stops her.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Plot holes: SPOILER: The plot hinges on fact that Blanche was supposedly crippled when a car driven by Jane ran into her and penned her to gate. In reality, Blanche was injured while driving a car and unsuccessfully tried to run over Jane, then crawled in front of car after Jane fled. Blanche's injuries would not be consistent with someone who had actually been struck by a moving vehicle as she claimed.
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