The T-shirt Max (Edward Judge) can be seen wearing actually has "White Horse" written on it in code. "#ffffff" is in hexadecimal and is the color code for white, "01001000 01101111 01110010 01110011 01100101" is binary code for letters "H-o-r-s-e".
The listing of the end credits differs between the original UK release and the subsequent US airing. Originally, the entire episode cast is listed in alphabetical order in the closing credits. In the subsequent US airing, the eight principal actors (Fischer, Baynton, Fry, Scodellaro, Owen, Quirke, Mullally, Lowe) are only listed in the opening credits.