1) There is portentous dialogue totally out of character (i.e. Linda & Freddie)
2) There are seemingly irrelevant storylines suddenly shoe-horned in (a cracked soil-pipe).
3) But the real give-away is that they found a builder prepared to work on a Sunday
- cue storyline about an un-qualified and un-supervised labourer who drills through a gas main causing mayhem and death with all the legal and moral consequences
- expect that to run and run.