The license plate on the car that Jenna Elfman destroys is 2GAT123. This same license plate appears in Beverly Hills Cop II (1987), Traffic (2000), Pay It Forward (2000), Mulholland Drive (2001), Crazy/Beautiful (2001), S.W.A.T. (2003), Go (1999) and L.A. Story (1991).
Alan visits the dentist in this episode and, after some treatment, is left with a temporary speech impediment that leaves him unable to pronounce his R's properly. It's possible that this was the inspiration behind the Barry Kripke character in "The Big Bang Theory," another show created by Chuck Lorre.
Episode title spoken by Charlie, to himself.