This mission was the last appearance for Barbara Anderson (Mimi) who replaced Lynda Day George during her absence in the seventh season due to pregnancy.
The gun the assassin assembles is an J&R Engineering M80 Carbine. It was used in other episodes, included "Run for the Money"
The helicopter (N9054) is a Fairchild-Hiller FH1100 (serial number 87). These are commonly mistaken for the Bell 206 JetRanger which also is seen numerous times on TV.