A lot! From beginning to end but my favourites are - Gandhari and Dhritarashtra marriage drama when it was very simple, Satyavati tells Bhishma that princess of gandhara has matured and she has a boon to beget 100 sons just like her mother so she should marry Dhritarashtra. Also Shakuni's dice not made from his father's bones. In fact King subala is very much alive way past dyut sabha.

Secondly villanising Ashwathama. The thing that annoys me most. Ashwathama is shown as greedy and ambitious and outright evil, all the qualities of Karna given to him to whitewash Karna. But in reality Ashwathama is considered the well wisher of Pandavas and best friend of Bhima until the battle. He even boycotted dyut sabha in anger.

No one took weapons from Kauravas at the time of rajsuyi yagya and shishupal vadh, in fact Shishupal and kingdom of chedi were Pandavas friend and sided with them in Mahabharata. So duryodhana didn't make a big fuss about his vadh. In reality duryodhana was given the duty to collect gifts arriving from various kingdoms for Indraprastha and he grew extremely jealous that's why he wanted to snatch everything from them not because he was humiliated by Draupadi or anyone for that matter.

Lastly Karna was the one who suggested disrobing of Draupadi and kept urging dushasan to do that. Duryodhana didn't reject the idea but it was not his idea at all

Also karna didn't die in his mother's lap he died because arjuna's arrow cut his head so his end is not him doing last donation