If you have two classes back to back and one goes longer than usual, how are you supposed to make it to class and not miss any information?
In college, unlike high more of the responsibility falls on you to make up the missed material. I would recommend you ask another person in the class that you were late, to share their notes. Sometimes it's good to explain to the professor afterwards why you were and explain your plan to cover if it happens again. I've found that other students are usually able to help out when asked.
Cheryl recommends the following next steps:
You can talk to your professor for the class that goes over and just let them know you have to leave on time (even if they are still lecturing) because you have a class right after that one and it is making you late.
You can always speak to the concerned professor to help you with the pointers he / she covered during the lecture.
If that is not a feasible option for you, you can always ask someone from the class to help you with the notes they may have taken down during the lecture - there always is someone in a class who takes down all the notes and points of discussion.
Hope this helps :)