The taxi ride only takes the fired candidate round the block for an interview then takes them to a hotel to stay the night
Sir Alan's Secretary is actually an actress.
The boardroom is actually a set to make it more practical for filming to take place.
On the final episode of the show, the crew film Lord Sugar saying "you're hired" to both of the finalists so that Lord Sugar has a few months until the episode is released to decide who he actually wants to invest in. When he decides, the scene of winner getting hired is edited in.
The walk of shame scenes are filmed in advance.