The safe was actually stolen when Pam and Tommy were in London, not while they were at home.
When Tommy is grabbing coffee from the fridge in the garage, a bag of "Veggie Straws" can be seen on the top shelf in the background. Veggie Straws debuted in 2006.
The show begins in 1995 yet the Fat Boy Slim playing wasn't released until 1999. This trend continues in the second episode.
Though this takes place in 1995, the softcore porno that Rand watches at his apartment is Virtual Encounters 2 (1998), which came out in 1998.
The safe contains "big face" $100 bills, which were not released into circulation until the summer of 1996, several months after Rand stole the safe.