I didn't know that one. That along with the Britney Spears one are among those that do not accept the answer minus the number, unlike most of the other ones on the quiz.
How do you know which answers are accepted if you did not know it? Did you try the quiz again immediately? I think you just admitted how you got your high rank :O
1000 can also read as "one thousand" so no, the clue is not fine as it is. I eventually just wrote the entire title out, minus the a, and it was finally accepted.
That song has been covered by everybody from the Andrews Sisters to the Rolling Stones and more recently John Mayer. Cole did do it first, but I personally prefer the Chuck Berry version.
Movies With Numbers as Titles