Jaleel White's guest appearances this season as Steve Urkel created a gaping plot hole in the second episode of Step by Step: in that episode, White also guest starred as Urkel, and interacted with the show's characters. But Step by Step treats Full House as a fictional television series; thus, Urkel couldn't have appeared as a "real" person, because he was a character on a "fictional" show. See more...
Revealing: I'm not sure of the episode, but it is somewhere in Season 8. The family was having dinner while Nicky and Alex were upstairs. When the Tanners were having ice cream sundaes, Jesse decides to bring some upstairs to Nicky and Alex. When he sets them on the table upstairs, you could see that they are props.
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