Crowds of people walking through London under alien influence: Semi-check; crowds of people wandering around London industrial estates/suburban Ealing who are really Bane.
Tie-in with Doctor Who story: Check; tie-in with the entire UNIT era, actually, as well as with the Sontaran two-parter.
Girl protagonist's mum is annoying: Check; just when you think she can't become any more of a stereotype of a middle-aged mumsy woman, she takes a job in a little shop and whips out a giant bar of Dairy Milk.
Mobile phone as plot device: Semi-check; the UNIT people's hands-free earpieces do get used as a means of immobilising them all temporarily.
Luke says something so daft that you have to wonder how he gets through life without being mercilessly bullied: Check, as he works through his adoption issues. "Luke, I am your mother," indeed.
Sonic lipstick: Check, mere minutes after the wristwatch scanner.
Wristwatch scanner: Check
One or more of Sarah's companions falling under alien influence: Non-check; Gita doesn't count, and neither does Luke falling for Mrs Wormwood's blandishments.