At the ending of the second half of the closing credits, there's a comedic disclaimer that says "No cats were harmed in the making of this film." Apparently, both the Cartoon World and the Real World shown in this movie is unharmed to its characters.
At the first half of the closing credits, the first few of them (the directors, writer and producing credits) is in horizontal, the rest (From the Executive Producer to the Garfield the Cat credit) is vertical.
When Garfield is trying to find some area in his room, the opening title flies in and connects to shine. After a few seconds, the words positions themselves and slides out.