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If there is no array match in the query portion of an update, any $ field name is copied directly to the result document.

c = db.c;
c.drop();

c.save( {} );
c.update( {}, { $set:{ 'a.$':5 } } );
printjson( c.findOne() );

result

{ "_id" : ObjectId("501840bc20fa57fe9c46e970"), "a" : { "$" : 5 } }

is duplicated by

SERVER-5371 update with positional operator does not validate existence of a positional match

is related to

SERVER-7186 Batched oplog application increases frequency of idempotency violations

SERVER-4713 Upsert with $-positional operator can create bad documents