Kermit and SS humans:

[Daffyfan4ever]

Yeah, I was going to mention that. I think he also talked to Luis as well.

Also, there were instances when the gang saw Kermit on TV such as in "Follow That Bird" or "Elmo Saves Christmas," but there was no direct interaction. I think by the time I started watching the show in the 80s, Kermit was mainly seen in inserts. I guess Jim Henson was too busy with other projects to put Kermit on the street with the SS humans. Same deal with Ernie.

 

[D'Snowth]

There was also a skit where Bob and Kermit talked about frogs.

Bob McGrath said in an interview that that bullfrog he was holding for that skit actually peed on Jim's head, but he kept his cool as if it wasn't a big deal.

 

[Daffyfan4ever]

Ew. That would really gross me out.

 

[BEAR]

Kermit also interracted with Alan in the first of the hurricane episodes.

He also interacted with Luis, Maria and Gabby in that scene.

 

[D'Snowth]

Don't forget in that same season he was in a musical bit with Kep Mo.