This is the first episode to air under ownership of A&E. (Seasons 1-3 aired on CBS.)
The DeMars brothers, Angus and Malcolm, are likely named for brothers Angus Young and Malcolm Young from AC/DC.
The character of Eddie Martin is introduced at the end of the season 3 finale episode, played by Michael Dempsey. Between seasons, the character was recast. They had to reshoot the final scene of the season 3 finale, because Skeet Ulrich was cast as Eddie Martin.