Conan Edogawa's powers and abilities
of Shinichi's detective skills carry over to his Conan form, although Conan does not have the reputation Shinichi had. He repeatedly demonstrates the ability to remember every detail of an investigation or other topics he cares about and may have a photographic memory to manage such perfect recall so consistently. Conan's fastidious attention to detail allows him to notice minor inconsistencies in crime scenes and suspect testimony that other people miss, and using astute logic he uncovers the reasons behind those inconsistencies to link them to the crime. Conan has an extraordinarily broad knowledge of many subjects and trivia that help him solve cases; something he likely acquired from his incessant reading in his "first childhood". There are only a few people like Heiji, Saguru and Yusaku who are at the same detective level as Conan, with Yusaku, be the only person who is noticeably better than Conan.
As a child, Conan can attract less suspicion while investigating crime scenes, get away with searching people's personal property, and ask innocent questions without setting suspects on guard, although it comes with the drawback of not having Shinichi's authority or reputation. He is also shown able to read lips.[13]
Additionally, in the Red, White, Yellow case, Conan was specifically referred to and asked for help by a classmate.
Observation Sense
He is highly observant on almost every single thing in his life, whether at a crime scene or his everyday life, whether he is Shinichi or Conan. If he notices anything amiss, he will frequently leave the Detective Boys, or whoever to investigate immediately, esp. if he thinks the organization is involved, but his curiousity knows no bounds.
It is kind of like his brain will not rest, as long as he is awake because he frequently observes everything, and wants to investigate it.
At one point, this is why he was kidnapped, and placed in a coffin with a fake bottom, in an old-style hearse, which the kidnappers did not know was going to be sent to the scrapyard and crushed within hours of placing him in there.
He is also a real people watcher and spends a lot of time watching people help determine careers, emotions, what is going on with them to name a few. If need be he will get up, and investigate further.
He frequently notices momentary facial expressions that are only on a person's face for a second or two, which is all it takes for him to register the true emotions of people and various culprits. Such as a suddenly hidden smile upon finding the body of one's spouse, and the list goes on.
Some examples are the following:
In Home of Beika's Grenier, when the old man used a hand to stand up, despite the presence of 4 little children, Conan noticed instantly the look that the old woman gave her husband since he should not have used his hands to stand up in the presence of others.
In The Tense Tea Party, in Haido Central Hospital, Conan was watching Amuro, and instantly noticed how he reacted after a small child was counting down, "Three... Two... One..." and shouted out, "Zero!!" Since Amuro noticed his reaction, he had to cover it up, and say that "'Zero' was one of his nicknames when he was a little child."
This was the first clue to Conan that Amuro may not just be the Black Organization Member Bourbon, but something else too. During The Scarlet Return, Conan began to deduce from his observations, that Amuro was from the Japanese Secret Police, which became confirmed by the end of the saga.
Even when he was little he was practicing observing details and guessing careers of people, not always accurately, but he was a little boy at the time. This became much more accurate as he became older, and he retained this knowledge when he shrunk down to Conan.