Moving House - S3-E1
Revealing mistake: At the beginning when Frank is directing the vans, we see that one gets its windscreen broken by a ladder from another van. However, the glass breaks just before the ladder touches it.
Wendy House - S3-E2
Other mistake: When Frank, Betty and the insurance assessor are sitting on the sofa, it's obvious that all three actors are trying hard not to laugh when the assessor starts sinking into the sofa.
Continuity mistake: When Frank is on the phone taking down the details off his boiler repair job, he is told the address is 26 Upton Down, but the house where Frank does the job is number 24.
Visible crew/equipment: Towards the end, just before he gets into his car, a boom mike shadow can be seen on Mr Lewis's jumper.
Visible crew/equipment: At the end the camera lights can be seen reflected in the side of the second fire engine.
Wendy House - S3-E2
Revealing mistake: When Frank is talking to the postman at his front door, it's so obvious it's a studio set. The background seen outside the front door is painted scenery.
Visible crew/equipment: Just after the Spencers have arrived at the airfield you can see the crew reflected in the windows of their blue Citroen.
Continuity mistake: When Frank first gets into the plane cockpit he leaves the door open - it soon shuts by itself after a camera angle change.