Disfellowshipping is the extreme punishment. There are other lesser punishments including being 'Marked', 'Private Reproof', 'Public Reproof', loss of 'privileges' and being interrogated by two or more elders in the back room.
To clarify any confusion with regard to the national anthem, a JW may stand in respect if part of the observance involves everyone singing along whereas if everyone is only asked to stand, then a JW is expected to remain sitting. If a JW is already standing, for example when entering a sporting venue when the anthem is being played, the JW may then remain standing respectfully in one location until the anthem concludes.
While attending a sporting event is not forbidden, JWs are told not to favour any particular team as that is considered a form of nationalism.
Although Jesus gave the Lords Prayer as an example of how to pray, JWs typically do not recite the LP or join in when the Lords Prayer is being recited by a group. Reciting the LP in a group is often done by other religions and so a JW would not want to suggest they are supporting or agreeing with any other religion.