After seeing Charlie Cooper in the autopsy room Stella comments that Simone de Lille's work visa had expired 2 weeks ago. Two scenes later Mac tells Deputy Inspector Stanton Gerrard that Simone's work visa expired 3 weeks ago.
Hawkes is talking with Ross about a metal ball and mentions it's made of lead like a BB and having no rifling characteristics. BB are made from steel of copper usually and BB guns and BB rifles are smooth bored and would not create rifling on a BB.
When Sheldon Hawkes examines the body that is still in the Guillotine you can see her eye lids slightly moving when illuminated.