The "belgian" Florian de Groote has a dutch name, is supposed to be Flemish but speaks french with a Norwegian accent.
Austin-Healey 3000 driving into the estate had a straight 6 engine but the sound track is clearly from a v8.
The car stealing the generator gets stuck in the mud and is spinning its wheels. When it starts moving it makes a squealing sound like tires on dry asphalt despite the ground being wet and muddy.
The restaurant where Eddie and Susan meet with Florian in Belgium has the logo of the Smith & Wollensky steakhouse chain clearly visible on the wall behind them. Smith & Wollensky has no locations in Belgium.