Episode #2.2 - S2-E2
Continuity mistake: The detectives are inside Father John's office for his interview. First time the clock is fully in frame, it's 8:20. When Richard exposits for the audience what a postulant nun is, it's 8:17, and it stays the same when Richard speaks again in the same position, asking the priest about anything suspicious happening. When Sister Anne arrives moments later, the clock jumped to 8:26. When she makes her exit, we're back at 8:17. (00:05:00)
Episode #2.2 - S2-E2
Character mistake: Dwayne takes only the thumbprint of Sister Marguerite before she leaves. (00:12:50)
Episode #2.2 - S2-E2
Continuity mistake: When Camille holds the list with the mysterious names and numbers, she holds it with the left hand at the very top of it in close-up, while it's much lower in the shots before and after. (00:14:10)
Episode #2.2 - S2-E2
Continuity mistake: In the first scene of the episode with the whiteboard, the writing of the names is different in close-up and wider shots. (00:15:25)
Episode #2.2 - S2-E2
Continuity mistake: When Richard tells Camille about the nightmares of Sister Geoff Capes he still has, he is shaking his right fist, which becomes the left at the cut. (00:17:40)
Episode #2.2 - S2-E2
Continuity mistake: Interviewing Laura Masters, Daryl Dexter's business partner, she makes a joke about imported champagne; the level of champagne in the flute changes between shots, from full above her thumb, to an inch below it. She is also sitting back with the glass in hand when she had just put it down and was leaning forward earlier. (00:28:05)
Episode #2.2 - S2-E2
Continuity mistake: When Richard and Camille intercept Dexter by the holy water pool, he has either both or just one hand on the camera, depending on the angle. (00:32:00)
Episode #2.2 - S2-E2
Continuity mistake: Sister Marguerite is mending the bike when Dwayne arrives. She halts with both hands the wheel's rotation, but in the next shot the wheel is spinning again. (00:34:20)
Episode #2.2 - S2-E2
Continuity mistake: In her passionate defense, Sister Anne's veil changes position throughout the scene - windy as it is, keeping strict continuity would have been practically impossible. (00:40:00)
Episode #2.2 - S2-E2
Character mistake: The prescription pills are labeled "Sister Therese", but Therese is not a nun yet (in the credits of the episode itself she is the one not labeled as such, but just by her name). (00:44:50)
Episode #2.2 - S2-E2
Other mistake: Sister Marguerite throughout the whole episode is wearing not very nun-like quantities of lipstick and mascara - especially considering that the head nun is depicted as strict and frowning upon things like chewing-gum.
Episode #2.2 - S2-E2
Character mistake: Throughout the episode, multiple times members of the clergy themselves talk about Therese not having yet received "holy orders." She would never have, considering that nuns only take "vows", the former are just for men.
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.