Who is Brian Doyle-Murray, who plays the Bubble Boy's father? We noticed the similarity to Bill Murray and then caught the credits.
BTW, I love the scenes where two (or more) characters are on the same wavelenth and it's like they share the same mind. Example from the Bubble Boy episode -- Jerry is complaining to Elaine that George drives fast just to make good time and cites case when he made it to the (airport?) in 25 minutes. Then it cuts to George -- who stops Susan from "necking" because he wants to make good time and cites case when he made it to the airport in 15 minutes. They say nearly the same thing -- except Jerry is whining and George is lying (about the 15 minutes). Very spooky mind link.
Other examples of this mind synchronicity? It much be all over the place.