Continuity mistake: In season 1 whenever count Olaf's tattoo is shown, it is always on his inner left ankle (the reptile room part 2, Mr. Poe wipes the makeup to reveal it on the inner ankle, and In the Wide Window part 2 when Sunny chews through the broomstick and Olaf's lag is revealed it is also on the inner ankle. In this episode, after Sunny loosens the laces on Olaf's shoe and the Baudelaires defeat Olaf in the arm wrestling, the tattoo is on the outside left ankle.
Continuity mistake: Count Olaf enters the bedroom with a knife and says "Oh orphans! [Beat.] Our ship awaits." A few minutes later when we see the same event from another direction, there's no pause, and the delivery is noticeably different, more "oh orphans, our ship awaits." (00:19:45 - 00:23:20)
Continuity mistake: When Olaf is standing at that secretary's desk, he reads the calendar and says his name is "haircut." The secretary and the top of her desk are shown several times and in most of the shots, the calendar is visible near the secretary's left arm. However, in at least one of those shots, the calendar vanishes.