Joe--I copied these from the comment you made. That way we won't have to keep scrolling back.
1. Did Jesus baptize anyone?
John 3:22 says yes, John 4:2 says no.
2. When Jesus first gave the 12 apostles powers of healing and sent them forth, how did he tell them to dress?
Matthew 10:10 and Luke 9:3 says he told them to go barefoot and without a staff. mark 6:8-9 says he told them to wear sandals and bring nothing BUT a staff.
3. What were the names of the 12 apostles?
Of the four lists (Matt 10:2-4, Mark 3:16-19, Luke 6:14-16 and Acts 1:13), all agree on 11 of the names. However, Matthew and Mark list the 12th apostle as Thaddeus, while Luke and Acts name Judas brother of James (a second Judas, not Iscariot).
4. How many believers were there at the time of the ascension?
Acts 1:15 says they numbered 120, but 1 Corinthians 15:6 says over 500.
My responses (I’ll try to be brief.):
1. In context, a dispute had arisen between John’s disciples and Jesus’ disciples, instigated by the Pharisees (4:1) because Jesus had baptized more than John. This would be in keeping with the gradual diminishing of John’s ministry in favor of Christ’s which John testified would happen (3:30). To reconcile 3:22 and 4:1, many commentators of 150 years ago (the contemporary commentaries I have on John do not address the apparent contradiction) agree that the baptisms of 3:22 took place not by the literal hands of Christ but by the hands of His disciples. The disciples baptized by His orders and directions (4:2) for as Matthew Henry remarks, “his disciples' baptizing was his baptizing. Holy ordinances are Christ's, though administered by weak men.”
2. One helpful way to look at the Gospels are as photo albums. They should not be expected to line up in every detail. If you and I were to take snapshots of the same event it would be from two differing perspectives. What may stand out to you may not be important to me. In many ways the Gospels are incongruous yet what is reported fits with the individual writer’s purpose. Each account stresses to take next to nothing on the journey, emphasizing the disciples’ dependence upon God for provision for the journey. Perhaps Mark made a minor adaptation that would have fit with his Roman audience’s understanding, or perhaps a different geographical setting that would have been important to Mark specifically.
3. All commentaries agree that Judas brother of James and Thaddaeus are one in the same man. I am no textual critic, but there is a variant in the Greek texts of this verse and quite possibly Thaddaeus is a corruption of Judas in the Greek. In some Greek manuscripts, Thaddaeus is actually Lebbaeus. My conjecture would be that these are nicknames, possibly of devotion or endearment, that the individual authors would have been aware of.
4. Acts 1:3 says that Christ remained on earth forty days after his resurrection. 1 Corinthians 15:6 gives no specific time frame of when Christ was seen during that time but only that 500 people saw him at once. So the two events, 120 seeing Him at the ascension and 500 people seeing him at another time, are mutually exclusive.Those are my take!