At the start of the show when Shawn & Gus are riding with Lassiter, Gus's seat belt moves from the side of his shoulder to the top repeatedly.
When Shawn is shooting at the tourist, he shoots 15 consecutive shots without time in between to reload.
At around 39 minutes, as Shawn and Gus are breaking out of the mine shaft under the building, they knock three boards down to create a hole to crawl out of. You can clearly see strips of Velcro on the boards and where they were attached for easy breakaway.
At about the 28 minute mark as Shawn and Gus enter the Sheriff's office, you can see the mic dip just into view.
At about 12 minutes in, after Shawn thanks Hank for saving their lives, Hank says "I'm the sheriff, that's what I'm paid for." Gus then says "Technically, you're not a real sheriff, and when you say 'they' you actually mean 'you'.... Hank never said "they". It seems as if Hank blew his line and was supposed to say "I'm the sheriff, that's what they pay me for."