During the show movie posters are seen in an office, one movie is called Crimson Harvest, the title of Crimson Harvest (1994).
Although set in Rome, no filming actually took place there.
Bruce Abbott (Monte Hayes) appeared in three episodes as different characters (S8.E4, S11.E14, S12.E8).
Mike Connors appeared as Boyce Brown in two episodes (S11.E16, S12.E8). Connors also appeared in S5.E16 "Truck Stop" as a completely different character (Walter Murray).
Allan Miller (Jake Farber) appeared in five episodes as different characters (S1.E16, S2.E13, S10.E5, S11.E11, S12.E8).