The Mixtures "In the Summertime" and—as a result of the 1970 radio ban, during which many Australian radio stations refused to play Australian and British music released by major labels—received much more airplay than had initially been expected for a group on a small record label. The single went to #1 in Australia for six weeks. They followed up with "The Pushbike Song" (produced by David Mackay), which went to #1 in Australia for two weeks, hit #2 in the UK Singles Chart, and went to #44 on the "Billboard" Hot 100 in the U.S. after being released on Sire Records. The
What Was Missing wanted to spend time with the friends, Marceline gets embarrassed and chases Finn, Jake, BMO and Bubblegum from the Door Lord's abode. "What Was Missing" was written and storyboarded by Rebecca Sugar and Adam Muto from a story developed by Mark Banker, Patrick McHale, Osborne, and series creator Pendleton Ward. The episode was directed by Larry Leichliter, with Cole Sanchez serving as creative director and Nick Jennings serving as art director. The original title for the episode was "Door Jam", but this was later changed because, according to Muto, the show tries to avoid pun-based titles. "What Was Missing" was