When Marshall calls his mom to take down the photo she sits down to get on the computer and go online. As she's getting online you can hear the old school dial-up internet connection. Judy is talking to Marshall on the landline phone which means she wouldn't have been able to connect to the internet.
When Ranjit pulls the car over so Robin and Barnie can barf, he moves his hands over a steering wheel that doesn't turn.
When Lily and the Mother are on the Long Island Rail Road, another train is seen passing them through the window. The LIRR uses a third-rail while the passing train is equipped with an overhead pantograph. It is in fact a Connex commuter train from Melbourne, Australia.