Conversation so far:
When did season 4 come out?
The 1970-71 season brought new additions to the cast include tall, lanky.
Who were the cast?
the cast include tall, lanky, sad-eyed Dennis Allen, who alternately played quietly zany characters and straight man for anybody's jokes; comic actress.
What happen in Season 5?
The show celebrated its 100th episode during the 1971-72 season, with Carne.
Are there any other interesting aspects about this article?
After winning the Academy Award for Best Supporting Actress in Cactus Flower, Goldie Hawn made a guest appearance in the third episode of the fourth season.
Did they win any other awards?
CANNOTANSWER.

Question: What else was going on with the seasons?
Self-contained rewrite: What else was going on with the seasons of Rowan & Martin's Laugh-In, besides Goldie Hawn appearing in the third episode of the fourth season?