More mundane abuses include the following:
1) use of "extra-ordinary" ministers of (i.e. non-priests and deacons) to distribute communion. The rules are that all available priests at that mass should distribute communion, but often enough, one or more of them will sit back while the laity does the distribution.
Even at the most liberal parishes in my diocese, the Priest and Deacon are always involed in the distribution of communion. In fact, I don't think I have ever seen a priest sit back while communion is being distributed.
2) use of unsuitable instruments, including drums (!?) or anything electric. A kind of half-way point between Orthodox practice (voice only) and the current Catholic one, would be to reduce all non-human instruments to one, mainly as accompaniment or for tuning purposes. The disappearance of Gregorian chant is a post-conciliar abuse.
I am not sure that drums and guitars are technically proscribed, but, I do agree with you that sacred music is more fitting and should be the prescribed form of music.
3) celebrating versus populum.
Yes and no. The council never suggested that celebration should be versus populum, but is it an abuse? If it is, then its a nearly universal one. I do agree that ad orientem is the desired mode of celebration.
4) altar girls - tolerated or approved at the highest levels
Not sure that there are currently any rules that prohibit this in the new mass. Though, not having them is more in line with tradition. Does anyone know if there is Catholic canon against female altar servers?
5) Saturday "vespers" masses (introduced after WWII, intended originally as a temporary measure)
I don't think that this is technically an "abuse" under the Novus Ordo, though I will say that it's certainly not preferable.
I can't say I'm all that fond of the underlying theology of many of the RCC traditionalists (Anselmian satisfaction theology to explain the sacrifice of the mass), but the focus on the liturgy is the correct one.
Well, most don't really understand Anselm.