Encounter at Farpoint (1) - S1-E1
Other mistake: When Q the Judge enters on his throne, at one point, the hydraulic arm the throne is on is visible, despite being black to blend in. Conversely, in "All Good Things...", the final episode, the arm is missing having been matted out by CGI techniques. (00:21:45)
Stephanie Plays the Field - S4-E22
Other mistake: It looks like she has earring holes. Didn't she get her ears pierced later on in the series?
The Bald and the Beautiful - S3-E7
Other mistake: At the end of this episode, there is a typo in the credits: "Directed by" is written twice. (00:22:30)
Hot-Rodding Teenagers from Dimension X - S1-E4
Other mistake: General Traag's weather weapon causes a blizzard across the city, yet when the Turtles and the Neutrinos come up to the surface after the blizzard had been occurring for a while, none of the cars parked on the street, including the Neutrinos' two flying convertibles, are covered in snow. The interior of their cars should have been full of snow.
Other mistake: When LB comes into Tweeg's room and he sees him covered in spots and he is discoloured he freaks out. Why does he freak out? He just saw Tweeg in the previous episode all covered in spots so he should know that it's him.
Other mistake: When Vincent is talking to Father about going to the masquerade party, you can see that both of his hands have fur and claws, but when he puts his hand on Father's shoulder and says "Don't worry", his hand is normal.