Hammerly:
is for Ron Hammerly, one of the writer and behind the scenes guys.

Searer:
is named for Troy Searer, one of the writers.

Principal Sachs:
He is one of the writers and producers of the series.

Demopoulos:
Is named for Jay Dempoulous, one of hte writers.

Danso Gordon's longest series stint.

A scene filmed and cut from the episode featured the gang (minus the Coach) saying goodbye to each other after graduation.

Adam Frost's longest stint on a series.

Eugene: Man, these chairs are freezing my buns.
Silk: What are you wearing under that?
Eugene: You're supposed to wear something underneath?
Silk: And they're letting you graduate?

Silk
Is taking pictures with the camera upside down at the party.

Eugene
Despite the fact that Eugene stated he wasn't wearing anything underneath his robe, he is see wearing pants as he gets his diploma.

It is very rare for an entire high school basketball team to graduate at the same time. Normally there would be lower classmen on the team.