The Charles Atlas trunks are being placed on a Warehouse shelf. Adjacent to it are: a golden lasso (Wonder Woman); a green archer's bow (Green Arrow); a massive hammer (Thor); a purple umbrella (The Penguin).
Although cold open "teasers" are common in TV, this episode runs for over 12 minutes before the opening title and credits (more than a quarter of the 43-minute story).
Claudia cries "Allons-y" in this episode. This is a common catchcry of the Tenth Doctor (played by David Tennant) from Doctor Who.
When the agents enter the Hairy Tarantula comics store, the song playing is "Superman" by R.E.M.. The song is one of the few covers in REM's catalog; it was originally written/performed by a Texas band called The Clique in 1969.
Sean Maher & Jewel Staite , behind the counter in the restaurant, were both in "Firefly" as on-again, off-again romantic interests.