What are the differences in Beowulf's funeral between Beowulf the poem and Beowulf the movie?

In the anonymously written epic of
Beowulf, the funeral of Beowulf is simplistic and true to
Anglo-Saxon culture. Beowulf's body was laid upon a very large funeral pyre, adorned
with his riches and armory, and set ablaze. The funeral pyre was placed upon land, and a
woman sang of the fear Beowulf's land will face now that he was gone). The smoke pouring
from Beowulf's pyre was "swallowed" by heaven.

In the
movie, the 2007 Robert Zemeckis adaptation, Beowulf was laid upon a funeral pyre, set
ablaze, and pushed out to sea. Only Wulfgar witnessing the funeral. While the pyre
burned, Grendel's mother climbs onto the pyre and lays by Beowulf's side. The pyre
sinks; Beowulf and Grendel's mother disappear into the sea.