The Good, the Bad, and the Dominatrix - S7-E23
Continuity mistake: When Sara takes the photos of Lady Heather's neck bruising you see 2 distinct ligature marks. When Brass serves her with the search warrant you can see only the remnants of one ligature mark, then when she is in Brass' office later she again has 2 ligature marks.
Revenge of the Bog People - S2-E2
Continuity mistake: When Doleman is roleplaying with McKern, initially the chains are properly attached to his handcuffs. But when they start talking about spikes, he's holding the chains in his hands.