Tony's boss asks him if he likes philosophy. Ricky Gervais has a philosophy degree.
When Tony is taking a picture of Rosemary (the 100 year old woman), she holds two middle fingers. In Britain, this is the "V sign", an obscene or insulting gesture similar to flipping someone off.
With Ethan Lawrence's character now a regular from this point on, this is the first time he's credited as "James"; for his two appearances in series one, the character was credited as "Recorder Kid".