In his struggle with the hair dryer in the bathroom, Allan knocks out half the contents of the medicine cabinet. In the next shot, the bottles he knocked out are back in the cabinet.
Linda's champagne glass switches from her left hand to her right hand between shots.
When Sharon Lake is in Allan's apartment, Allan jerks a record, and the disc comes flying out. First he's holding the record with the back of the sleeve facing front, then when he jerks the record, the front of the sleeve faces front.
The phone in Dick and Linda's bedroom changes between scenes from a standard set to a "Princess" set.
When Bogart is talking to Allan in his apartment about his missed opportunity to kiss Linda, Bogart's hands are apart. Then when Bogart says he's had his face slapped plenty of times, his hands are together and then apart again.
Bogart states that he shot Lizabeth Scott (in Dead Reckoning (1946)),
when actually she shot him. Since he was speeding at the time, he crashed and she died.
Allan gets out of a "DeSoto" cab number 1453016. Days later Dick gets out of the same cab.
While unlikely, coincidences do happen. This is not a Continuity error.
While unlikely, coincidences do happen. This is not a Continuity error.
As the cable car starts up the hill, vehicles go through a red light throughout the entire scene.
With Linda, Dick, and Sharon watching him, Allan in his attempt to act cool, upsets a chair, end table, and lamp with a crash. Both Dick and Sharon can be seen lowering their heads to hide their smiles. Dick (Tony Roberts) can be heard wheezing in his attempt to suppress his laughter.
The film being reflected in Allan's glasses is not of what he is supposedly viewing.
While Allan is putting on his tie and talking with Bogart through the mirror, a microphone wire can be seen hanging down from his shirt.
When Allan and Linda walk up the steps to Linda's apartment, a hand-held mike is visible at bottom of screen briefly.
When Allen is almost taken away by his hair dryer, you can see a small hole which the crew pushes a small stick to knock over his medication and pills off the bathroom cabinet.