What kinds of "some things" are you talking about? And is it a matter of "won't embrace Orthodoxy for the totality that it is" or just that it takes time and sometimes people don't even know that they're still clinging to something.
There is no doubt that many Protestants who are disaffected with their current tradition are looking outside theirs for answers, but are doing so in a way which is syncretic, i.e. they blend what is good with theirs with what is good from another tradition. If Protestants do come over to the Orthodox Church, there is a great tendency (and I have personally seen this many times) to bring over their Protestantism with them and "Orthodoxize" it. They won't embrace Orthodoxy for the totality that it is and insist that some things typical of Protestants should exist alongside of the Orthodox tradition which they join. And that will only cause confusion and chaos.
Since you asked, here is a short list, albeit incomplete. Keep in mind that these are my observations. Others may well corroborate, others may bat an eye.
They want, or even demand:
1) use of Protestant hymns in some services (they claim "well, such and such hymn, is perfectly Orthodox. It may well be, but that's not the point).
2) lay readers. (However, reading the epistle or OT is reserved for tonsured readers. Wanna read? Get tonsured.)
3) to be on par with the priest which reeks of anti-clericalism. (they want to read the same prayers as the priest or go where the priest goes; insist on shaking hands rather than asking for blessing)
4) use only of the KJV for readings. (not saying anything about this one)
5) shorter services. (not saying anything about this one)
6) to be absolved corporately rather than through the confessional. In other words, can't everyone just say a few common prayers together instead of having to go through the humiliation of a personal confession with the priest?
7) use of American or English style religious music. (Blech! Can't even hold a candle to Byzantine)
to move feast days to nearest Sundays because only Sundays are for church.