What are the dead-end scenarios?

When recently playing through Zak McKracken and the Alien Mindbenders I messed up the part with retrieving the breadcrumbs. Unknowingly at the time I found that this caused a dead-end later in the game as the item was required to continue.

Could someone supply a comprehensive list of all the dead-end scenarios? It is frustrating playing through the game without knowing a specific action will get you into a state whereby you cannot continue at a later point.