If you look at the golf clubs that Mikey Palmice unloads from the car when he and Junior arrive at the golf course, neither of them have a full set of clubs... and only one of them has a putter.
After Junior pushes the pie in Bobbi's face, there's a piece of pie crust on her chin that moves with her mouth. There's a close up of her crying out, "I don't understand", where the pie crust is no longer on her face. In the next cut, when she begs him not to leave, the piece crust is visible again.
When Tony asks Artie Bucco "How's cheffing at Dimple's" at the soccer game, Artie responds with "You gotta come sample the salad bar. We have a special chemical brightener. Keeps the lettuce crisp." Artie is referring to a discontinued sulfite compound with the name brand of, "Stay-White." The white, dry powder he is referring to allowed potatoes, apples and many other cut vegetables to not discolor. Many people were found to be allergic to this product, and the FDA revoked its use in 1986. At this point in time, 13 years after its discontinuation, no restaurant that ever used it would have any of the product remaining to use, even if they chose to continue using it illegally.
When Tony is reading the newspaper article about Coach Hauser accepting the job at the University of Rhode Island, you can see the article stating that the University is located in Providence, Rhode Island. The University of Rhode Island is located in Kingston, RI. While there is a small campus in Providence, this is technically the University of Rhode Island: College of Continuing Education. Besides, the location of where he would be coaching soccer would be at the Kingston campus.
When Tony slams the door after kicking Artie out of his office at the Bada Bing, the light fixture to the left of the door as well as the Heineken mirror on the wall shake, indicating this is a set and not a sturdy structure.
Uncle Junior wears white underwear beneath his towel in the locker room at the golf and country club.
When Charmaine is talking to Artie about Coach Hauser in the garden, you hear Charmaine say "The father lives in Europe somewhere, they haven't been able to reach him," but it is obvious by looking at her lips that this is not what she said.