My guess would be that the sacraments listed in the death register might be those which are associated with someone's death. Any marriage which took place would be in a separate register -- baptisms and births, marriages and deaths all have their own registers.
See The Three R's of Researching Roman Catholic Church Records by Lisa Alzo | May 14, 2013 from Archives.com's Ask the Experts section:
Deaths, Burials and Cemetery Records. Parishes may have detailed
records of deaths and/or burials (in particular if the church has its
own cemetery). Such records can include the name of the deceased
(including maiden names), age at death, date and place of death or
burial, the name of the informant, and whether the sacrament of
Extreme Unction was received. The birthplace of the deceased may also
be listed (if the deceased was an immigrant, perhaps even his or her
town or village of origin).
The header for column four says "Names of parents, or wife or husband" which suggests that parents' names are recorded when the deceased is a child, and when the deceased is married the spouse is listed. In the case of someone who is married, to find parents' names you need the marriage or baptism/birth registers.
In addition to the other resources list at the bottom of Alzo's article, see: