Tight corners with plugs
step 1. rub some talc or baby powder on the corner that it is catching, both on the seal and the surface it is catching on.
step 2. put a small piece of weather seal(available at a cheap shop like spend a penny or cheap as chips for about $2 for a roll) under the seal, about 10mm from the corner. This will help to bridge the gap between the two different heights. The poor design of many models of fridges means that a seal has to perform miracles to seal between two different levels because of the white plug thing they put in the corners.
step 3. As you are closing the door, wedge a screwdriver in to flatten the seal as you close it.
step 4. Heat the corner of the seal with a hairdryer to assist it moulding into shape.
step 5. leave it shut for around 2-3 hours.