Episode #1.4 - S1-E4
Continuity mistake: Megan grabs DI Richard Poole's hand sobbing "I'm scared." We're talking about her left hand, because in the right hand she's holding the handkerchief he gave her. When DS Camille Bordey butts in, she is clinging to his hand with her right, and holds the hankie in her left. It keeps happening even during the conversation. (00:03:55)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.