I had this feeling while reading the LN as well, but the 180 degree change of Tohka from serious mode to deredere mode didn't feel right. Having a well established image of
armor clad warrior girls does not help at all...
The ED animation looks really cheaply made... maybe we will have a different one next week?
If not mistaken they added something extremely minor unique to the anime:
really liked that tiny bit.
The earpiece, as shown in the anime, is stealthed. Watch the part where Shidou thought Reine was going to give him a kiss.