These all relate to usability concerns with the contacts app and the contacts view in the dialer. This is with image, 57.
1 - there is no visible way to distinguish the contacts app vs the contacts view in the dialer other than a subtle hint that there are more tabs in the top panel. As they have different features available this can be a bit confusing.
2 - the list is too long to search and even with the letter shortcuts can take some time, search should be restored even if with a short term fix
3 - when adding a new contact, the gray help text to fill in the fields is not at all visible, probably needs different font treatment, not matching the mockups
4 - there is no filtering support so the "All Contacts" phrase has no context unless its as opposed to favorites, but with no favorites seems very odd.
5 - the ability to go directly to a letter is nice, perhaps we need some indication that this option exists, although once learned its fine. Its also not accessible if you have favorites, the user needs to scroll up first. Perhaps Favorites category should also collapse and provide an entry to the quick select.