YES!
Read that BEO VERY, VERY, VERY CAREFULLY! Read it line by line. Make any corrections or questions you have on there and email them to the coordinator at once! Once you sign and return that puppy, it's your event! I would delay signing it until around the time you pay... we have. I have to FAX that monster back today!
We realized what our inclement weather plan for the dessert party based on the BEO was... the one we just woudn't use! Check everything including the people supposed to be in limos, the cake layers and decorations, ceremony music, processional orders, etc. Use a fine tooth comb. The BEO is what gets sent to everyone that has any part in your wedding from Disney's side of the house. If it's wrong there, you're not goign to have much luck in fixing the situation.
The others are right... you should have gotten another PDF file with the final "budget" owed in it.