Almost at the beginning when they are playing cards if you noticed, there are five guys and four drinks (cans) - three beers; one Schlitz that Goodsen is drinking, two Old Milwaukees (one for Miles and one for Glen) and there is a Coke for Barry. When the camara is pointing from Goodsen towards Glen and Chuck you can see all four drinks as described above, but when the camera is pointing from Chuck towards Goodsen one of the Old Milwaukee cans changed to a Tab drink. You can see the Coke can also.
When he's at the Dairy Queen talking to the two guys and smoking, one scene he puts the cigarette out and in the next scene he's smoking it again.
Contributed by: Mark Hinsdale
The images of the suburban train (it was Metra) approaching when Joel is anxiously waiting and fidgeting at the (Deerfield) station is backwards. The locomotive number is actually 144, but appears in its quick flash views as 441, but the "4's" are backwards.