Avinu Malkeinu: Some have the custom to recite part of it verse by verse after the Chazzan, however, it is not the Chabad custom to do so. The words Roia Gzar are recited without pausing in between.
L’David Mizmor: Many communities recite it verse by verse and some say it all together and there are some who don’t say it at all.
Many have the custom to open the Aron Hakodesh, however this is not the Chabad custom.
It is the Chabad custom to recite the entire Tehillim with a Minyan after Maariv.
One should be sure to derive benefit from the candles at one point after Yom Kippur begins (e.g. when returning from Shul).
Kriat Shma before bed is recited as on Shabbat and Chag. Baruch Shem is recited aloud.
When going to bed, it is advisable that a man should not cover himself warmly. At the very least, he should leave his feet uncovered.
