We see very little of the other universe in season 1, so I'm not sure where you're getting the idea that technology was less advanced "over there" in season 1 than in later seasons. They may not show any examples of particularly advanced technology in the brief scenes of Olivia crossing over, but absence of evidence is not evidence of absence, and in fact there is some behind-the-scenes evidence that the creators already intended the technology to be more advanced, in the form of the New York Post prop which was seen briefly in the episode:
This page says that a replica of this prop was distributed as part of the season 2 press kit, and it contained several headlines indicating more advanced technology:
Weather Report - "No corrective action by NWS expected" - Weather can
now be controlled by the government
Cartoon - Solar, Wind, and Oil made obsolete by Zero-Point Energy - an
alternate energy source developed by Massive Dynamic.
Genetically Engineered pets
FDA approves facial landscaping - a facial reconstruction technique
developed by Intrepus. David Esterbrook, the R&D officer at Intrepus
is also mentioned. Intrepus and Esterbrook can be seen in the Fringe
episode The Cure.
Here's a scan of the sections with those headlines:
In addition, as shown on this page listing differences between the two universes mentioned in the first two seasons, we also saw more evidence of advanced technology onscreen by season 2, like the season 2 episode "Momentum Deferred" showing the "shapeshifting mechano-organic soldiers" from the other universe, the episode "Jacksonville" which indicated they had CD players in cars by 1986, the episode "Peter" showing they had digital cellphones in the early 1980s, and the episode "Over There, Part 1" which showed they had "Nanite Regeneration technology that can heal third degree burns covering 90% of the body in just 3 months".