Conversation so far:
When did season 4 of Rowan & Martin's Laugh-In come out?
1970–1971.
Who were the cast of Rowan & Martin's Laugh-In season 4?
The 1970–71 season brought new additions to the cast including Dennis Allen, comic actress Ann Elder, who also contributed to scripts, tap dancer Barbara Sharma, and Johnny Brown.
What happens in season 5 of Rowan & Martin's Laugh-In?
Arte Johnson and Henry Gibson left the show after the 1970–71 season.
Are there any other interesting aspects about season 4 and season 5 of “Rowan & Martin's Laugh-In?
Goldie Hawn won the Academy Award for Best Supporting Actress in the episode Cactus Flower.

Question: What else was going on with the seasons?
Self-contained rewrite: What else was going on with Rowan & Martin's Laugh-In season 4 and 5?