The "roar" of the bobcat was not actually a sound made by a bobcat. The sound effect used is that of a North American Cougar. Bobcat sounds aren't very big cat like so the change was most likely used to make it sound more intimidating.
Booth and Bones go undercover as Tony and Roxy Scallion, identities they first used in Season 2 Episode 8 - The Woman in the Sand
Mr. and Mrs. Schumacher are played by John Ratzenberger and Millicent Martin respectively. They also played characters in the Cheers universe, Ratzenberger as Cliff Clavin in Cheers and Martin as Gertrude Moon in the spin-off, Frasier.
Bones and Booth typically use the undercover names of Wanda and Buck, respectively. In this episode, however, they abandoned those familiar monikers in favor of "Tony" and "Roxie".