As an corporate event coordinator with many years of experience, I can tell you that nothing is 'normal' from one event to another. The contract is the 'bible' for each event, and should be given your utmost attention before signing, especially the vague clauses!
There is no 'and now they are saying'. If it wasn't specified in the signed original Contract or Modification to Contract ... then it's not going to happen. The only thing you must be very careful of is the clauses, as this is where many additional costs are hidden. They rarely stand up in small claims court, but it is still an unnecessary hassle, so they continue this practice because the majority of clients allow them to get away with it.
In particular, you should look for clause(s) mentioning "travel related expenses', '2 hours distance from primary place of business', 'possible addition of ??% for miscellaneous expenses'. Anything where they leave room for additional undefined cost(s) through abstract wording.
As for passing you on to the assistant, this is a common practice but should have been explained to you. It is not unusual for the 'Head Coordinator' to lay all the ground work such as initial meeting with client, presentation(s), finalizing the contract, etc. ... and then passing it on to an assistant to work on putting it into effect. Think of a fashion designer ... original concept, financial planning, presentation/shows ... but they have assistants and seamstresses to sew the clothes. Quite honestly, if a planner/designer did everything .... I would be worried .... serious potential for overworked meltdown and heaven forbid .... something bad happen to the 'one person' who is doing your wedding.
Read your contract carefully. If you do not see a provision for meal cost, call and ask "What clause in the contract addresses meal costs for all your staff? If you dislike the idea of 'ticking them off' before your wedding, simply state theses prices are unreasonable. I will look into alternative meals myself.
Also look for 'Gratuity' clause. If there is a ??% gratuity cost for specific jobs, demand that these people be deleted from the list. They cannot expect you to pay ... salary, tip, and meals.
ACE UP YOUR SLEEVE
Event venues/planners depend on 'referred business'. Mention in a deprecating manner (so not perceived as a threat) "It's a good thing I'm learning all this, as many of my friends are reading my blog/facebook to plan their own weddings. I'll be the expert to let them know who to hire and what to look for".
Congratulations and Good Luck
P.S.: I've never included meals costs for myself or assistants. I recommend them to bring peanut butter sandwiches .... high in protein, easy to eat and digest!!