1-Wren asked Spencer to go out for coffee.Wren asked Spencer to go out for coffee then she declined and he asked about tea. Everyone else in PLL seems to only drink coffee, and at the clue things in the end there is often a tea cup of A or a member of A-Team drinking tea!
2-When Dr Sullivans room was trashed it said "Nosey bitches die". American spelling of nosey is nosy, whereas the english spelling is nosey! Who's from england? WREN!
3-Wren works at Radley.He also has access to Mona/pills/Drugs.He was also present when Hanna and Emily were at the hospital.