The glamour here and in the case of the breaking of Balder's barrow is akin to that which the Druid puts on the sons of Uisnach.
The tale of the king who shuts up his daughter in an "earth-house" or underground chamber with treasures (weapons and gold and silver), in fear of invasion, looks like a bit of folk-tale, such as the "Hind in the Wood", but it may have a traditional base of some kind here.
A folk-tale, very imperfectly narrated, is the "Clever King's Daughter", who evidently in the original story had to choose her suitor by his feet (as the giantess in the prose Edda chooses her husband), and was able to do so by the device she had practised of sewing up her ring in his leg sometime before, so that when she touched the flesh she could feel the hardness of the ring beneath the scar.
Bits of folk-tales are the "Device for escaping threatened death by putting a log in one's bed" (as in our Jack the Giant-Killer).

The device, as old as David's wife, of dressing up a dummy (here a basket with a dog inside, covered outside with clothes), while the hero escapes, is told of Eormenric, the mighty Gothic King of Kings, who, like Walter of Aquitaine, Theodoric of Varona, Ecgherht, and Arminius, was an exile in his youth.

This traditional escape of the two lads from the Scyths should be compared with the true story in Paul the Deacon of his little ancestor's captivity and bold and successful stroke for freedom.
"Disguise" plays a great part in the folk-tales used by Saxo.

Woden disguises himself in a cowl on his earthly travels, and heroes do the same; a king disguises himself as a slave at his rival's court, to try and find occasion of slaying him; a hero wraps himself up in skins, like Alleleirah.
"Escaped recognition" is accordingly a feature in many of these simple but artistic plots.

A son is not known by his mother in the story of Hrolf.
Other "Devices" are exemplified, such as the "booby-trap" loaded with a millstone, which slays a hateful and despised tyrant, imposed by a foreign conqueror; evasion by secret passages, and concealment in underground vaults or earth-houses.