[1] When the Mothers of Invention bandleader Frank Zappa was injured during a concert in London in 1971, Kaylan and Volman found themselves at an impasse, as the group was out of action for a time.

The duo sang backing vocals also on Bruce Springsteen's first top ten hit on the Billboard chart, the 1980 song "Hungry Heart", while in 1982, they released a four-song EP on Rhino Records (RNEP 603) under the name Checkpoint Charlie.

In 1984, as 'The Turtles... featuring Flo & Eddie' (together with three other groups from the 1960s: Gary Puckett, Spanky and Our Gang, and the Association), they traveled across the U.S. and Canada as The Happy Together Tour.

On August 1, 2013, Flo & Eddie, having gained ownership of The Turtles' recorded output, filed a lawsuit against satellite radio broadcaster Sirius XM for failing to pay sound-recording royalties in the states of New York, California, and Florida.

[3] On June 22, 2015, a Florida judge ruled in favor of Sirius XM, as that state has no specific legislation concerning sound recording property rights.