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.
Sonic the Hedgehog once said that if a character dies in a different game that they wouldn't be able to regenerate. However, the crash of Vanellope and Ralph's light-cycles in "Tron" 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.
In Wreck-It Ralph, we learn that if a game character does not show up in his game during working hours of the arcade and it's noticed by the patrons, the game is taken out of order and could be unplugged forever. However, the events where Ralph and Vanelope are in the internet take at least 24 hours and yet neither of their respective games are taken out of order. Unless, of course, the Vanellope and Ralph clones from "Kingdom Hearts III" were temporarily drafted to cover for their originals.
Ralph takes the bidding on eBay to $27,000 by bidding against himself. To prevent accidents on eBay, any effort to out-bid yourself only resets your High Bid limit. If the price is $300 and the same person bids again, the winning bid is still $300 until someone else bids higher. Also, there is an increment rule. If the bid is $300 and you bid $400, your High Bid limit is $400 and the current bid becomes $301. (Unless someone else has a High Bid limit that is greater.)
The goof item below may give away important plot points.
After the virus makes copies of Ralph, it's not accounted for anymore. By its programming, it should continue to look for insecurity and replicate it in the internet until someone or something stopped it, which is not shown in the movie.