When Larry Tate and Augustus Sunshine "feel a sudden compulsion to go back to the Stephens' house" they are just driving by 4 parked cars on their right which (in order) are brown, dark red, white and blue. The cars can still be seen as Larry commences his "U-turn" from the most central of the two lanes on the road their using. Immediately after, mid-turn, a wider shot shows Larry's car turning from within the lane next to the curb and only 2 parked cars are slightly behind them, being a red car with a white roof and a white car (with some space between them). The scene has also moved from road with a white building on the right of Larry's car to road with 2 large trees where the building should be.
Just after Darrin is sprayed with shaving cream by his mother-in-law (who then vanishes from the bathroom "mirror"), the amount of shaving cream on his left shoulder has slightly increased (and its pattern changed) in the next shot when he is complaining to Samantha.
The French Samantha speaks is grammatically wrong: she says the witch is "microbée", the past participle of a verb which does not exist in the French language. (The noun "microbe" does not serve as verb in the French.)
Although the series is set in Westport CT., when Larry and Mr. Sunshine are driving, there are palm trees in the background.