Other mistake: In the last scene of the episode, the opening shot is a Boeing 707 in flight. The 707 logo on the tail is backwards. It appears they flipped over a piece of film stock from a shot earlier in the episode, where the same plane was flying in the opposite direction.
Other mistake: Vladik, incorrectly, tells Donfield on the phone to stand at the hot dog stand at 3 pm Monday. It should have been 11 am. Donfield in the "meet" scene refers to his 11 o'clock feeding" and Mr. Smith tells Solo (Donfield) his next meeting is between one and two pm. This would be impossible if the original meet was at 3 pm.