Yes, I believe that Donald Trump will call in favors from people to whom he contributed large sums of money. In typical "pay to play politic" fashion, Trump will allow for what are essentially bribes to dictate how he negotiates in the campaign and, if he is elected, in the White House.
Trump isn't a man who gives for no reason, he will expect those that he gave large sums of money to, to help him out later on down the line. He will put pressure on them and make them feel that they owe him something, this is how Trump usually does business.
Yes, Donald Trump will ask for favors because he has done the same thing as a businessman his entire life. Now that he is running for president, his ego is inflated even bigger than it was when he hosted Celebrity Apprentice. He believes he is entitled to any gift he receives, and he will not stop now.
It is understood in politics that just because someone donates money to a political candidate, they may or may not receive any special consideration in return. Most political favors to donors are to secure future donations, not for donations made in the past. This is the case for Donald Trump's past donations.