The term malignant narcissist is used to describe Idris Elba's character by a member of the parole board, Idris uses the same term to describe a suspect in the first episode of Luther.
When Colin wrecks the truck and the tree branch goes through the windshield, while he is in the truck the wipers stop (branch in windshield). When he gets out you see the wipers still working.
While Terri is speaking to her unexpected guest, a pan is on the cook top containing what are apparently two glass baby bottles inside for sterilization. She returns to the stove and the bottles are on the counter.
When Alexis (Colin's girlfriend) grabs her phone and runs away from Colin, she has a blackberry phone with a built in keyboard. When Terri finds Alexis's cell phone next to her dead body, under the bed, it's an Android phone.