The smiley face Topanga draws on the chart changes at least five times between shots.
At 12:03, when Alan comes into Corey's (and Eric's) bedroom, Shawn is crawling under Corey's bed headfirst (feet seen just as Alan enters).
At 13:53, Shawn crawls back out from under Corey's bed headfirst as Alan leaves, but he is never seen shifting position in order to allow for the 180-degree orientation change.
At 13:53, Shawn crawls back out from under Corey's bed headfirst as Alan leaves, but he is never seen shifting position in order to allow for the 180-degree orientation change.