To Save Us All From Satan's Power - S3-E10
Continuity mistake: When Tony sees Jackie Jr. getting a lap dance, the dancer has her top pushed up. After Jackie pushed her off and she moves past Tony, her top is down without having time to move it. (00:29:10)
Answer: That's not Jimmy, just a look-a-like. Jimmy's short and stout, the guy in "Christopher" episode is tall and medium built. The hair is also different.