Continuity mistake: When Alan is fixing his car in the garage and Ambrose comes down to taunt him, his adjustable spanner is 'open' by approx. 10mm. In close-up shots, it is virtually closed and opens up again on the wider shots. (00:47:48 - 00:49:32)
Continuity mistake: When Ambrose and Rosalind are sat outside the pub, you see Ambrose walking over with an amber-coloured full pint, and a full glass of water. When he arrives at the table, the pint glass is half full, looking like a dark mild/stout, and the glass of water is only two-thirds full. (00:53:47)