All-Star Cast: The Christmas Special. Its special guests included Cher, Grace Jones, a very young k.d. lang, Charo, Joan Rivers, Earvin "Magic" Johnson (cousin of Magic Screen), and Frankie Avalon and Annette Funicello.
Defictionalization: Pee-wee's scooter was reproduced as a full-size replica for kids, as was Pee-wee's ventriloquist dummy, Billy Baloney.
The Merch: Though normally known for die-cast model cars, Matchbox produced a line of 5" figurines and a full-sized Playhouse playset for them. The company also produced a talking puppet of Pee-Wee's porcine pal Vance when Big Top Pee-wee came out.
In the first season, Pterri was voiced by John Paragon (who portrays Jambi), but in the second season, he was voiced by George McGrath (who voices Globey). From the third season on, however, Paragon again voiced Pterri.
What Could Have Been: According to an interview with Entertainment Weekly, CBS was interested in doing a sixth season, but Reubens said he felt worn out and wanted to try other things. His infamous 1991 arrest for indecent exposure and lewd conduct in a porno theater in Sarasota, Florida happened mere months later, but contrary to rumors, Reubens and others say that the show getting canceled was because Reubens decided to end the show, not because of the arrest (though the reruns were taken off the air and Pee Wee Herman's mainstream popularity was tarnished).
The series almost began life as an adaptation of Louis Sachar's Sideways Stories from Wayside School, with Pee-Wee hosting the episodes. In the end, the concept...ahem...fell by the wayside, but the ideas that were generated for School then went over to Playhouse.