Most of those are unfortunate additional interpretations that I don't think are grounded in the context of what Jesus was saying when He brought it up (and they tend to be emphasized mostly in evangelical circles).
Mark 3: 22 - 29
22And the teachers of the law who came down from Jerusalem said, "He is possessed by Beelzebub! By the prince of demons he is driving out demons."
23So Jesus called them and spoke to them in parables: "How can Satan drive out Satan? 24If a kingdom is divided against itself, that kingdom cannot stand. 25If a house is divided against itself, that house cannot stand. 26And if Satan opposes himself and is divided, he cannot stand; his end has come. 27In fact, no one can enter a strong man's house and carry off his possessions unless he first ties up the strong man. Then he can rob his house. 28I tell you the truth, all the sins and blasphemies of men will be forgiven them. 29But whoever blasphemes against the Holy Spirit will never be forgiven; he is guilty of an eternal sin."
Jesus is responding to the "teachers of the law" who claim Jesus is driving out demons by the power of the "prince of demons," Beelzebub. This attribution of the Holy Spirit's power and work through Jesus to the adversary is the reason Jesus responds with the illustration of the house divided against itself. This attribution of the Holy Spirit's power and work to "Satan" is the reason Jesus pronounces this an eternal sin, for which there is no forgiveness. The teachers of the law, in their rejection of Jesus as the long-awaited Messiah, look to discredit His obvious work as Messiah by claiming His power comes from someone other than God. It's a blasphemy that Jesus elevates to a level that no other blasphemy can reach...one that will not be forgiven. To lie about the Holy Spirit is the ultimate rejection of Jesus, from people who know better. I think the pronouncement that this is an eternal sin is reserved basically for these "teachers of the law." I'm not sure it's possible to commit this sin at present, despite the idiots who post YouTube videos in The Blasphemy Challenge. Surely anyone who actually worries they may have committed this particular sin are not nearly so hopeless as they fear.
The "teachers of the law" whom Jesus addresses with His comments about blasphemy against the Holy Spirit KNEW that what Jesus was doing was the work of the Messiah, and they knew it was by the power of the Holy Spirit. To attribute the power by which Jesus did his work to Beelzebub, in their case, meant outright lying about Who was responsible for it.
Comments or musings made in ignorance today aren't of the same caliber of offense (if we may rightly call such an "offense") as what the "teachers of the law" did in the days of Jesus' ministry, because the "teachers of the law" knew too much to say what they