FamilySearch has digitized the "Parish register extracts, 1565-1838" for a place, "Caistor-next-Yarmouth"; the FamilySearch catalog indicates access to the films may be viewed at a FHL. See the catalog entry, DGS 8041547.
FamilySearch has a separate catalog entry for "Parish register transcripts of ... [including] Caister-on-sea"; also digitized, but restricted to access via a FHL. See the catalog entry, DGS 4234647. Entry notes "Caistor-Next-Yarmouth is referred to as Caster-on-Sea in the record."
Yet another FamilySearch separate catalog entry for "Parish register transcripts, 1563-1837"--authors include "Parish Church of Caistor-next-Yarmouth (Norfolk). This material has been digitized and is not restricted. See the catalog entry. DGS 4143541. I will look at this now. (Note, register begins as item 18, at image 532 of 1052]. Based on the modern handwriting, these filmed images seem to have been transcripts made at a later date. The first page opens with "Caister: This booke was bought and made in the yere of our lord god 1598 and in the fortie yeare of the reighn of our .... quene Elizabeth that is now ... This booke conteyneth all such ... as have been married christened and buried since the 18 of Aprill .... 1563 untyll this yere ... 1598.
at 26 of 273, " John Blessing the sonne of John and Margaret was baptized the xiii of January." (presumably 1593/4)
at 24 of 273, " Margaret blessing the daughter of John and Margaret was baptized the xx of August."
Published Norfolk marriage registers. 007905883, "Norfolk parish registers, marriages; Item 2; Vol. 7" image 91 or 795