It is worth setting out plainly what the primary text leaves unanswered, because secondary sources habitually fill the gaps without saying that they are gaps.
Who compiled it. No manuscript names a compiler, no contemporary source attributes it, and whether one hand assembled all five books is open.
When it was composed. The date 1641 appears in the text and the Goetia's catalogue descends from a printing of 1665, which sets a floor; the surviving copies run from the later seventeenth century into the nineteenth. Beyond that, nothing.
Where the four added spirits came from. Vassago, Seere, Dantalion and Andromalius have no antecedent anywhere that has been found.
Why the order changed. Weyer's sequence and the Goetia's share a population and almost nothing else. The best editorial suggestion available is that leaves of an ancestor manuscript were disarranged.
How the seals were derived. They are not in Weyer, they vary between manuscripts, and no rule has been found that generates the set.
What the ranks mean. They are never related to one another, and the catalogue is not ordered by them.
Whether any of the names descend from pagan deities. Bael and Baal, Astaroth and Astarte, Balam and Balaam, Caim and Cain: all argued, none demonstrated, and the texts themselves are silent.
Against that list of unknowns, the volume of confident detail in the modern literature is difficult to justify. The seventy-two are a well-preserved early modern compilation with a traceable immediate ancestor and a great many open questions behind it, and a reader is better served by holding the questions open than by adopting any of the answers on offer.