Bryan Alexander, USA TODAY 2:02 p.m. EDT March 28, 2014
The film, which opened March 21, continued the Muppet tradition of great celebrity cameos. Who could forget Steve Martin as a surly waiter in 1979's The Muppet Movie?
"It's the blink-and-you'll-miss-it ones that are really fun," says writer-director James Bobin.
Some of appearances, such as getting Usher to play a wedding usher, are written into the script, says Bobin, while others just seem to happen spontaneously. For example, Bobin knew he needed Sean Combs for a Muppets celebration scene.
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