As good as The Sopranos are I've come across several slipups recently after getting the CD's. Here's my favorite. The Famous scene when Janice shoots Richie Aprile. Stop the CD at exactly 44:03 and you can spot the following:

As Richies chair starts to fall backwards you can see a stagehand's hand holding his chair in place in midair. The hand is coming up from beneath the table at the lower lefthand corner next to the winebottle. You can detect it's presence at regular speed but can see the full 5 fingers if you stop it at the 44:03 mark. I can't take full credit as the director mentions that the guy was there in the commentary but he never says you can see it.