On on episode 16.15, David Tennant/Olivia Colman/Harvey Weinstein/Jessie J (2015), of the The Graham Norton Show (2007), host Graham Norton brought up the notion of the sexual tension between Alec Hardy (David Tennant) and Ellie Miller (Olivia Colman), even showing a couple of examples of fan art with the two of them together. Both actors strongly denied noticing any of this tension between the characters. It is interesting to note that that was just prior to this episode where Sharon Bishop (Marianne Jean-Baptiste) accuses the characters of having an affair, thereby bringing up the idea of sexual tension between them in-universe.
Olivia Colman (Ellie Miller) & Meera Syal (Judge Sonia Sharma) also worked together on Beautiful People (2008) as Debbie Doonan & Aunty Hayley respectively.
Despite the general media blackout surrounding Broadchurch, the Friday before this episode launched a segment from the opening scene was shown on episode 16.15, David Tennant/Olivia Colman/Harvey Weinstein/Jessie J (2015), of the The Graham Norton Show (2007), on which David Tennant (Alec Hardy) and Olivia Colman (Ellie Miller) had come to promote the series.
Charlotte Rampling (Jocelyn Knight) & Marianne Jean-Baptiste (Sharon Bishop) also worked together on Spy Game (2001) as Anne Cathcart & Gladys Jennip respectively.
David Tennant (Alec Hardy) & Eve Myles (Claire Ripley) also worked together on two episodes of Doctor Who (2005) as The Doctor and Gwen Cooper respectively.