Visible crew/equipment: When Blankman and his brother escape from the bank just before it explodes they are diving on the ground to escape the explosion. You can see that Blankman's brother is a stunt double. (01:04:30)
Visible crew/equipment: When Blankman programs J-5 to sniff out the bomb in the news building after saving Kimberly John, a crew member's arm can be seen as the actors and the robot round the corner.
Factual error: When Blankman is riding on the train tracks with his custom mobile, the computer screen shows a straight track when they are actually on a curve.
Continuity mistake: After the Grandmother dies and Blankman is walking home with his brother, we see a car pass with a wheel lock on the front driver's side tire. When we see it again a few shots later, it's now on the passenger tire.
Revealing mistake: When Blankman is using his homemade grappling hook, you can see that the string is attached to the top of the invention and turning the handle isn't doing anything as he's simply being lowered.
Chosen answer: He filmed a fake episode of his talk show for the film. You can see Kevin watching it (it has superheroes Gay Man and Midget Man).
LorgSkyegon