Not a 777 pilot, but on the type I fly the call is 'go around, set flaps'.
The call is similar on the 777 - "Go around, flaps 20".
Wouldn't be the first time that a pilot raised the gear when he'd been asked to raise the flaps, would it?
No, and it also wouldn't be the first time a go around has been initiated without pressing the TOGA switches, especially by ex-Airbus pilots, although I'm not saying that's the case here. I've seen it happen several times in the simulator: pilot pushes up thrust levers to commence a go around (without pressing TOGA), calls for Flaps 20, positive climb, gear up, meanwhile pilot takes hands off thrust levers and the thrust comes back to idle. Oops...