It doesn't have built-in week numbers. Only way you can get that is by adding a calendar, that's so silly. Just look at the "agenda" with a week number calendar added.
Google don't care about bugs. Type "Work 2.00" with "quick add" and it'll become PM instead of AM, i.e. "14:00 Work" and not the intended "2:00 Work". This same bug will appear any time between 1.00-6.59. This bug was reported ages ago, Google simply don't care.