Towards the end of Darryl's and Kevin's interview with the psychiatrist, the tilting lava box on the desk is down at the right side, from the brother's POV In the next shot, from the psychiatrist's POV, it is again down at the right side.
Water level inside lottery tank as the water is filling it.
The glass door in the studio shatters before J-5 makes contact with it.
The window panes shatter before Blankman and Other Guy rappel through them.
The TV screen on the Blankmobile doesn't match the tracks.
As Blankman & Kevin are escaping from the bank explosion, the guy coming down the stairs outside is clearly not Kevin (a stuntman).
As Kimberly Jonz reviews the tape of Blankman and Kevin Walker running from the exploding bank, you can see the padded mat they jump onto.
When Blankman and Other Guy are running with J-5 to find the bombs and they turn towards the bathroom, you can see someone reach their arm out to guide J-5 around the corner.
As Blankman and Other Guy are on the Blankmobile on the way to rescue Kimberly, the shadow of the crane camera is visible on a building to the left of the tracks.
When the store owner puts up the Store Protected by Blankman sign on the door, a California Lottery logo is clearly seen.
How is Balnkman able to get himself a bulletproof costume? He is supposed to be a superhero with no money. Yet, he is some how able to make and wear, a full bulletproof costume. It could be that this is a parody of hero films, but it's just not explained how he can do this, and the plot just leaves it open to debate.