Sir Paul McCartney (voiced by himself) makes a cameo appearance at Diane's birthday party in After the Party.
At the Golden Globe Awards ceremony in "Later", the announcer mentions that BoJack was forcefully removed from from the 1992 ceremony for exchanging blows with Sir Paul McCartney.
In Season 2, McCartney, famous musician, pops out of a cake at Diane's 35th surprise birthday party. Unfortunately, by then, everyone has left.
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- "I came all this way to jump out of a cake? Honest."
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