Jon Cryer played Emily Osment's father during the run of the TV series Hannah Montana
At one point Walden says to Jerry" how did you meet Hannah Montana here. " Emily Osment who plays Ashley in this episode played Lilly on the television show Hannah Montana.
The TV show, in reference to "Bazinga!", is the Big Bang Theory, also created by Chuck Lorre.
Miley Cyrus played Jake's girlfriend in a couple of earlier episodes. Emily Osment and Miley Cyrus both starred in Hannah Montana
Scott Bakula states that he filmed a 4th of July commercial where he portrayed himself as uncle Sam. Scott Bakula portrayed Dr. Sam Beckett in the original Quantum Leap.