In the episode where Spongebob is late for work for the first time and moves into the Krusty Krab. Right before he left, he forgot his shoe, then when it shows the scene where he jumps over the incomplete bridge you can clearly see he has no shoe. But when he walks in the kitchen at the Krusty Krab he has it on?!?!?!?!?

Nifty shoes, eh?