The British solicitor remarks that since the client's house is in Toronto, Canada is part of the Commonwealth, implying that is how his assets were frozen. However, the Commonwealth doesn't work like that. Canada is a fully independent country and not beholden to British laws or orders. The Commonwealth today is much more a loose cultural association.
The British judge repeatedly refers to it being morning in the UK while it is the evening in the US. In fact, Chicago is 6 hours behind the UK timezone (GMT -6 hours) so this situation could not occur.
James Thrush hands over a 'writ'. The English and Welsh courts dispensed with the term 'writ' many years ago. The correct term is a 'Claim'. In order to serve a claim under the Defamation Act 1996, the claimant (no plaintiff in England) would first have to carry out pre-action protocol. Pre-action protocol serves to settle claims that can be negotiated away before they enter the court system. If this was not carried out, the amount awarded could be reduced.
In the final scene depicting the English court, the barrister Mr Thrush refers to Mr Brannon as his 'learned colleague'. However, barristers only refer to each other in this manner and the fact that Brannon is a solicitor means he should only be referred to as 'my colleague'.