At the beginning, Doug and Carrie are watching T.V and "their song" comes on. Carrie mentions that it became their song during junior high. In a later episode, which flashbacks to Doug and Carrie meeting for the first time at a local nightclub, which would have to take place at the minimum age of 21.
Ray is introduced as a new character, but in Season 1 of Everybody Loves Raymond Kevin is a reoccurring character for 8 episodes. In the later cross over episodes Kevin James character is reintroduced as a "New" character, Doug Heffernan, on Everybody Loves Raymond.
Doug goes to motor vehicles to renew his license and is given a test. You do not need to retake the written test when you renew your license in NY. You only have to fill out a form.
When Doug leaves the DMV, he gets in his car. With both hands on the wheel, there is clear audio of the key turning and starting the engine, but Doug never did it: his hands were on the wheel or above, never off-camera so he couldn't have inserted and turned the key, to start the car.