In the deleted scene "Into the Internet", from the earlier version of the movie, the wi-fi router is placed at the top of the Fix-It Felix Jr. arcade cabinet. In the final version itself (also in the sweatbox portion of that particular deleted scene) the router is placed at the top of the Dragon's Lair arcade cabinet.
When Vanellope first arrives in the internet and searches Knowsmore for the steering wheel he returns a single search result at eBay. When she clicks the link, it takes her to the main landing page at eBay.com. She is then forced to try to find the steering wheel among the other auctions. In reality, clicking that link would have taken her directly to that auction.
When Yesss can't access the internet she gets on the phone and yells, "get me tech support stat!". Technical support just helps people figure out how to use their software. She would need a network administrator, a much higher skill level.
Sonic the Hedgehog once said that if a character dies in a different game that they wouldn't be able to regenerate, and yet when Ralph and Vanellope were in "Tron" they froze as if they were about to die. However, the crash of their light-cycles in the game did not technically kill them. They were merely frame-frozen in mid-air due to the virus affecting that part of the game.
When Shank accepted Vanellope to be in Slaughter Race, she didn't program Vanellope's code into the game, although the game is extremely dangerous; therefore making Vanellope vulnerable to the virus. However, after the climax, it was revealed that Shank had been able to put Vanellope's code into the game. Shank may have included Vanellope's code only after the climax event, maybe a few minutes before that scene.
After the virus makes copies of Ralph, it's not accounted for anymore. By its programming, it should continue to look for more insecurities and replicate it in the internet until someone or something stopped it, which is not shown in the movie.
In Wreck-It Ralph, the Sugar Rush game is shown being a double console game with two steering wheels and two seats. In this movie the game is a completely different console: standing version with only one steering wheel. There is no mention of this console change, of the game being unplugged and replaced. This was an obvious change for the main plot of a broken steering wheel, but inconsistent with the original movie and unexplained.
Near the ending of Wreck-It Ralph, all the Cy-bugs from Hero's Duty (including King Candy/Turbo) has been permanently erased in the invasion using Mentos in Diet Cola Hot Springs. In this movie, the Hero's Duty arcade cabinet is gone, possibly because of the movie's permanent abolishment of the Cy-bugs.