When Frank is trimming Art Sloan's shower curtain, the entire curtain is cut in half. When the camera cuts to Dennis and back to Frank, only part of the curtain is cut in half. When the camera cuts to Dennis and then Frank again, the entire curtain goes back to being cut in half.
When Dee shows off getting 10 flip cups in a row, it shows two more flip cups being needed to flip, but she only flips one more in the next cut.
(at around 39 mins) When the Gang goes to Molly's to start reigniting the rivalry, a cameraman is visible in the back on the left when Frank is disturbing one of the tables (soon before Art Sloan walks in).