True, Jesus did speak in parables, but it was usually pretty obvious when He was speaking that way as opposed to quoting historical events from the Old Testament. For example, when talking about Noah, He could have said something like this in parable form, "There once was a man who was considered righteous by God. Everyone else had become evil and consumed by their own lusts, so God instructed the man to build an ark large enough to carry his immediate family and lots of animals. When the man had finished building the ark, God sent a great flood and everyone died except for the righteous man and his family. So will it be when the Son of Man comes." Now compare the words that Jesus actually used and the fact that He was referring to events previously recorded in the Torah - it's a different style altogether:
Mat 24:37 As it was in the days of Noah, so it will be at the coming of the Son of Man.
Mat 24:38 For in the days before the flood, people were eating and drinking, marrying and giving in marriage, up to the day Noah entered the ark;
Mat 24:39 and they knew nothing about what would happen until the flood came and took them all away. That is how it will be at the coming of the Son of Man.