Wilder has not acted in any theatrically released films since, although he has starred in two murder mysteries and appeared as the Mock Turtle in an adaptation of Alice in Wonderland, all television films.
Mock turtle soup is the basis for the character of the Mock Turtle in Lewis Carroll's Alice's Adventures in Wonderland, the joke being that Mock Turtle Soup is supposedly made from Mock Turtles.
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However, in the following year's film version of Alice in Wonderland, Grant played the Mock Turtle and Cooper played the White Knight, having their only movie scene together (of sorts) as the entire cast appears in the tea party scene (including W.C. Fields as Humpty Dumpty).
In the Oldenburg and Ammerland regions of Germany, Mockturtlesuppe—the English designation "mock turtle" retained—is a traditional meal, dating from the time of the personal union between the Kingdom of Hanover and the Kingdom of Great Britain.