Green - was covered in the anime
Yellow - was briefly covered but not in its entirety
- The Prologue of Light Novel 1:
- The introduction of the classmates.
- How the classmates got into the fantasy world.
- Chapter 1:
- How Hajime was treated by his classmates throughout.
- The priests going over their world's situation. [EP02]
- The semi-introduction of the royal family (very brief but adds to how even the fantasy characters like Kaori).
- Classmates' stats and what jobs they were given. The reactions afterward.
- Hajime studying in the library and monologuing about the demi-humans.
- Training segments, including more instances of Hajime treatment by his classmates. [EP02]
- The Labyrinth entrance, and the first 20 floors (well more so primarily the 20th floor).
- The fight with the Behemoth. [EP01]
- More coverage over Hiyama responsible for targeting Hajime; from spying on the Inn discussion to the moment that he takes the shot against him.
- The post-battle scene, with Kaori in shock and eventually being knocked out by the captain. [EP02]
- The post-labyrinth scene with Hiyama and an unknown person blackmailing him.
- Chapter 2:
- Hajime going into detail about how he is leveling up during the floor with the Claw Bear. [EP01]
- Kaori sleeping while Shizuku trains, then spots Hiyama along the way. [EP02]
- Kaori wakes up and Shizuku comforts her. [EP02]
- Kaori wanting to get stronger to find Hajime with Shizuku helping her. [EP02]
- Kouki and Kaori's friends meet her after she is woken, Hiyama spies but gets spotted and runs off.
- Chapter 3:
- Hajime's journey from Bottom of the Labyrinth Floor 1 all the way to the Pandora's Box room. [EP02]
- Hajime going into more detail about how he's progressing with his level.
- Hajime's encounter with Yue, naming her. [EP02]
- The Scorpion battle. [EP03]
- Chapter 4:
- Hajime and Yue have a conversation about the labyrinth and how Hajime ended up meeting her. [EP03]
- The classmates & Captain return to the palace and report the news to the King. [EP02]
- The reaction over Hajime's fate with the classmates and the palace.
- The classmates returning to the labyrinth. [EP04]
- The classmates vs Behemoth battle in Floor 65. [EP05]
- Hajime and Yue facing the Raptors in the Bottom of the Labyrinth Floor 99. [EP03]
- Hajime and Yue discovering the cause of the Raptors and locate the source. [EP03]
- Hajime and Yue preparing for their venture into Bottom of the Labyrinth Floor 100. [EP03]
- Hajime and Yue vs the Hydra in Bottom of the Labyrinth Floor 100. [EP04]
- The Hoelscher Empire pays a visit to the palace to meet the classmates.
- The Hoelscher Empire test Kouki's skills.
- The Hoelscher Empire's Emperor appears, and afterward mocks Kouki's presentation and the palace.
- Chapter 5:
- Hajime and Yue find themselves at the main base of operations for the labyrinth. [EP05]
- Hajime and Yue explore the surrounding area and discover a coded message that explains the truth of the world. [EP05]
- Hajime and Yue gain new skills from the message. [EP05]
- Hajime and Yue decide to spend their time living in the base to build up and prepare for the path back to the entrance. [EP05]
- The Epilogue of Light Novel 1:
- The first brief appearance of the Bunny girl.
For a more proper in-depth comparison, I recommend checking out this
Reddit user's posts on each episode.