-Who is paying. That's none of the guests' business and doesn't determine who is hosting.
-The names of anyone other than the hosts and honorees (the couple). Nonhosting parents and relatives should not be listed. Minor children should also not be listed. The wedding invitation is not a playbill or family tree and does not "honor" anyone other than the guests.
-The names of deceased parents and relatives. The correct place to honor them is on a wedding program if there is going to be one.
-Any references to gifts whatsoever. This includes registries, "no gifts" requests, and any requests that the gifts be of a certain type or appearance (e.g., boxed gifts only/no boxed gifts).
-Dress codes other than "black tie" or "white tie" (and if used, the wedding must actually be black tie or white tie). "Black tie/White tie optional" should not be used at all.
-Descriptions of the hospitality (e.g., "dinner and dancing.") The correct wording is "Reception to follow" if the reception is being held at the same venue at the ceremony, or a card reading
Reception
Immediately following the ceremony
Venue Name
Street Address
City, State/Country
if the reception is at a different location.
-Whether or not alcohol is being served/type of bar (e.g. full, limited).