So many!
The Titanic disaster has rooted itself firmly in pop culture as one of those things we think we know the general story of, but the history is quite different. A few-
-Titanic wasn't speeding
-The fourth funnel wasn't "fake" or "a dummy", it just served a different purpose than the other three. It was *not* purely aesthetic.
-Titanic didn't go out with too little lifeboats... by 1912 standards. She actually had more than she was legally required to take, and was designed to take many, many more. The idea they were so sure of her reliability they cut on safety is very false. Also, no one ended up dying due to lack of boats, but lack of time. Titanic sank before she could launch all 20. While yes, it was inevitable that people would die due to lack of boats, they hadn't reached that point by the final moments. The idea of people trapped on board waiting to die with no way off isn't *quite* true. They were still trying to launch them within the last 5 minutes.
-Third class were not purposefully locked below and certainly not because of classism. This one requires a bit of a lengthy response but the short version is, it seemed to be all simply a matter of confusion and/or miscommunication. There was no active attempt to hold back passengers according to ticket- in fact, it was the exact opposite.
-There was no 300 foot gash. The damage was made along *roughly* 300 feet but it was a series of incredibly small indents and holes.
-Lack of binoculars- There was no such thing as "no binoculars". They had plenty - I think we have three sets from the wreck alone. While it's true that a last minute staffing change didn't give the crows nest access to a pair, it's incredibly important to understand it didn't matter match. Binoculars were not favored especially high, and were not required. The closest thing we can get to blaming them is testimony that states that binoculars *maybe* would have been just enough to avoid the collision. Maybe- but certainly not for sure. Titanic was almost on top of the iceberg by the time it was sighted, binoculars would have done nothing to see it earlier. A reading of the testimony shows us wishful thinking and hypothesized hindsight, not blame or condemnation.
All of these are centered around the theme that Titanic was the victim of hubris. The history, however, shows that that narrative is a consequence of post tragedy press and not reality. Titanic was an incredibly safe and advanced ship with some absolutely horrible luck. It's easy to nitpick to try and find reasons "why", but the reality is Titanic was very safe on a normal, boring (albeit famous) and over cautionary sailing.
I've tried to hit some of the bigger, famous ones here. The more nerdy you get and down the rabbit hole you go, the more there is to unpack :)