[grobdriver]

two evacuation slides on the doors inflated inside the cabin instead of outside

Oy vey!
There's an AD in the making!

[Strategerist]

So how are the slides activated? Was this operator error or equipment error?

If equipment error I could see a ridiculous number of aircraft (how many besides 777s have the same door/slide design or manufacturer?) grounded until a fix is implemented as this is a critical safety flaw.