When Rodney tells Cassandra he has the £2000 deposit for the flat he asks her if she wants cash or a cheque. It is a well known fact mentioned in a few episodes that the Trotters do not have a bank account. Therefore they could not pay by cheque.
When running out of the bar to escape the "Driscoll brothers", Steven Woodcock ("Jevon") loses his balance, as he gets up from the table, and almost falls over, only just managing to stay on his feet.