Russell Brand is mentioned in Jez' dialogue with Aurora. Russell Brand initially auditioned for the role of Super Hans.
A yard of ale is approximately 2 ½ imperial pints (1.4L).
The door numbers on Mark and Jez' floor are constantly changing. In this episode, Mark's direct neighbor to the left is seen as flat 4. In series 5 "Burgling", the door then says flat 6. In series 9 "The Willaim Morris Years," that same door says flat 3.
The distance between Shropshire Union Canal to Garsington is about 3 hours.
Another one of Mark and Jez's neighbors is seen in the hallway in this episode, entering from the far stairwell by apartment 6. This is a different man than the one seen entering apartment 7 in S3E4.