When Steve McAndrew plays back the recording he made of Helen Wray on his mobile phone she says "I know you weren't the only one who had sex with her, you just paid the least". When Steve later plays the message to Colin Ogilvy the line has changed to "I know you paid for sex, you just paid the least".
In the opening scene Strickland refers to Detective Superintendent Sandra Pullman as D.C.I. (Detective Chief Inspector) Pullman, a demotion.