At the start of the show, Mr. Feeny tells Mr. Turner that Shawn missed a history exam, but in the final scene, Shawn says he heard he missed a Biology exam.
Correction: He actually missed both exams. Cory and Shawn were talking about him skipping out on the biology exam at Chubby's when Shawn was getting ready to leave for "Europe".
The door that leads to Devon's office has been several things throughout the series, including the girls' room, the boys' room, and Feeny's office.
Shawn: (at the bus station)Jon? How'd you find me?
Jonathan: Easy; once I found out where you were going, I figured, 'Shawn Hunter; Europe; ...bus'.
Shawn: Here's my ticket - next stop, Paris!
Jonathan: Paris Texas
Shawn: I thought the 'TX' stood for tax...
Cory (on the phone): Oh great, Turner's machine. Now I gotta listen to three minutes of Cat Stevens.
Cory: I said I don't wanna talk about it!
Alan: You did not say that.
Cory: Well I don't wanna talk about it. Definitely said it that time.
Amy: Typewriter? Oh no. Eric, did you put a waffle in the computer again?
Eric: Mom, I was 15. Let it die.
Mr. Turner: Hey George, what's up?
Mr. Feeny: Well I just wanted to be sure you knew that the Hunter boy missed his history test this morning.
Mr. Turner: He what?!
Cory: Oh, that's my fault, my fault. I was supposed to tell you that Shawn had a severe case of uh...help me out here.
Mr. Feeny: Sloth?
Cory: Yes! Hong Kong Sloth!
Alan: Why didn't you use the computer?
Eric: Well, it's a paper on the Amish and somehow it just seemed wrong.
Devon: You know in my house, growing up, all my parents ever talked about were the three M's: money, marriage, and mortgage.
Shawn: Yeah, my dad always talked about the three B's: babes, bucks, and brewskies.
Shawn: John, I'm not running away. I'm finally going someplace, doing something with my life. You know, I could ski the alps, or even go to Spain and chase the bulls.
Turner: Uh, actually they chase you.
Shawn: Who needs Spain? Europe's a big town. I'm sure there's tons of cool stuff I could do.